Physical properties of IP Pegasi: an eclipsing dwarf nova with an unusually cool white dwarf (2009)
Copperwheat, C. M., Marsh, T. R., Dhillon, V. S., Littlefair, S. P., Hickman, R., Gaensicke, B. T., ...
We present high speed photometric observations of the eclipsing dwarf nova IP Peg taken with the triple-beam camera ULTRACAM mounted on the William Herschel Telescope. The primary eclipse in this...
The expanding bipolar shell of the helium nova V445 Puppis (2009)
Woudt, P. A., Steeghs, D., Karovska, M., Warner, B., Groot, P. J., Nelemans, G., ...
From multi-epoch adaptive optics imaging and integral field unit spectroscopy we report the discovery of an expanding and narrowly confined bipolar shell surrounding the helium nova V445 Puppis (Nova...
Parsons, S. G., Marsh, T. R., Copperwheat, C. M., Dhillon, V. S., Littlefair, S. P., Gansicke, B. T., ...
We derive precise system parameters for the pre-cataclysmic binary, NN Ser. From light curve fitting we find an orbital inclination of i$ = 89.6^{\circ} \pm 0.2^{\circ}$. From the HeII absorption...
Time-resolved spectroscopy of the pulsating CV GW Lib (2009)
Van Spaandonk, L., Steeghs, D., Marsh, T. R., Torres, M. A. P.
We present time-resolved optical spectroscopy of the dwarf nova GW Librae during its rare April 2007 super-outburst and compare these with quiescent epochs. The data provide the first opportunity to...
Southworth, John, Hickman, R. D. G., Marsh, T. R., Rebassa-Mansergas, A., Gansicke, B. T., Copperwheat, C. M., ...
We present time-resolved spectroscopy and photometry of SDSS J100658.40+233724.4, which we have discovered to be an eclipsing cataclysmic variable with an orbital period of 0.18591324 days (267.71507...
A survey for post common-envelope binary stars using GALEX and SDSS photometry (2009)
Maxted, P. F. L., Gaensicke, B. T., Burleigh, M. R., Southworth, J., Marsh, T. R., Napiwotzki, R., ...
We report the first results of our programme to obtain multi-epoch radial velocity measurements of stars with a strong far-UV excess to identify post common-envelope binaries (PCEBs). The targets...
Gaensicke, B. T., Dillon, M., Southworth, J., Thorstensen, J. R., Rodriguez-Gil, P., Aungwerojwit, A., ...
We discuss the properties of 137 cataclysmic variables (CVs) which are included in the Sloan Digital Sky Survey (SDSS) spectroscopic data base, and for which accurate orbital periods have been...
A dusty component to the gaseous debris disk around the white dwarf SDSS J1228+1040 (2009)
Brinkworth, C. S., Gänsicke, B. T., Marsh, T. R., Hoard, D. W., Tappert, C.
We present Infrared Spectrometer And Array Camera (ISAAC) spectroscopy and ISAAC, UKIDSS, and Spitzer Space Telescope broadband photometry of SDSS J1228+1040—a white dwarf for which evidence of a...
SDSS J080449.49+161624.8: a peculiar AM CVn star from a colour-selected sample of candidates (2009)
Roelofs, G. H. A., Groot, P. J., Steeghs, D., Rau, A., De Groot, E., Marsh, T. R., ...
We describe a spectroscopic survey designed to uncover an estimated ~40 AM Canum Venaticorum (AM CVn) stars hiding in the photometric data base of the Sloan Digital Sky Survey. We have constructed a...
A Dusty Component to the Gaseous Debris Disk around the White Dwarf SDSS J1228+1040 (2009)
Brinkworth, C. S., Gaensicke, B. T., Marsh, T. R., Hoard, D. W., Tappert, C.
We present ISAAC spectroscopy and ISAAC, UKIDSS and Spitzer Space Telescope broad-band photometry of SDSS J1228+1040 -- a white dwarf for which evidence of a gaseous metal-rich circumstellar disk has...
Hunting high and low: XMM monitoring of the eclipsing polar HU Aquarii (2009)
Schwarz, R., Schwope, A. D., Vogel, J., Dhillon, V. S., Marsh, T. R., Copperwheat, C., ...
We want to study the temporal and spectral behaviour of HU Aqr in the X-ray domain during different accretion states. We obtained spectra and light curves from four different XMM-Newton pointings...
Optical pulsations from the anomalous X-ray pulsar 1E 1048.1-5937 (2009)
Dhillon, V. S., Marsh, T. R., Littlefair, S. P., Copperwheat, C. M., Kerry, P., Dib, R., ...
We present high-speed optical photometry of the anomalous X-ray pulsar 1E 1048.1-5937 obtained with ULTRACAM on the 8.2-m Very Large Telescope in June 2007. We detect 1E 1048.1-5937 at a magnitude of...
Hunting high and low: XMM monitoring of the eclipsing polar HU Aquarii (2009)
Schwarz, R., Schwope, A. D., Vogel, J., Dhillon, V. S., Marsh, T. R., Copperwheat, C., ...
Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries (2008)
Pyrzas, S., Gänsicke, B. T., Marsh, T. R., Aungwerojwit, A., Rebassa-Mansergas, A., Rodríguez-Gil, P., ...
We identify SDSS011009.09+132616.1, SDSS030308.35+005444.1, SDSS143547.87+373338.5 and SDSS154846.00+405728.8 as four eclipsing white dwarf plus main sequence (WDMS) binaries from the Sloan Digital...
SDSS J080449.49+161624.8: A peculiar AM CVn star from a colour-selected sample of candidates (2008)
Roelofs, G. H. A., Groot, P. J., Steeghs, D., Rau, A., De Groot, E., Marsh, T. R., ...
We describe a spectroscopic survey designed to uncover an estimated ~40 AM CVn stars hiding in the photometric database of the Sloan Digital Sky Survey (SDSS). We have constructed a relatively small...
ULTRACAM observations of two accreting white dwarf pulsators (2008)
Copperwheat, C. M., Marsh, T. R., Dhillon, V. S., Littlefair, S. P., Woudt, P. A., Warner, B., ...
In this paper we present high time-resolution observations of GW Librae and SDSS J161033.64-010223.3 -- two cataclysmic variables which have shown periodic variations attributed to non-radial...
The fainter the better: cataclysmic variable stars from the SDSS (2008)
Southworth, John, Gaensicke, B T, Marsh, T R
The Sloan Digital Sky Survey has identified a total of 212 cataclysmic variables, most of which are fainter than 18th magnitude. This is the deepest and most populous homogeneous sample of...
SCP06F6: A carbon-rich extragalactic transient at redshift z~0.14 (2008)
Gaensicke, B. T., Levan, A. J., Marsh, T. R., Wheatley, P. J.
We show that the spectrum of the unusual transient SCP06F6 is consistent with emission from a cool, carbon-rich atmosphere at a redshift of z~0.14. The extragalactic nature of the transient rules out...
SDSSJ084539.17+225728.0: the first DBZ white dwarf with a metal-rich gaseous debris disc (2008)
Gaensicke, B. T., Koester, D., Marsh, T. R., Rebassa-Mansergas, A., Southworth, J.
We report the discovery of a third white dwarf hosting a gaseous debris disc, SDSSJ084539.17+225728.0. The typical double-peaked CaII 8498,8542,8662A emission lines can be modelled in terms of a...
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Shahbaz, T., Martin, E. L., Copperwheat, C.
We present multi-colour photometry of the M8.5V ultracool dwarf "pulsar" TVLM 513-46546 (hereafter TVLM 513) obtained with the triple-beam photometer ULTRACAM. Data were obtained simultaneously in...
Southworth, John, Gaensicke, B T, Marsh, T R, Torres, M A P, Steeghs, D, Hakala, P, ...
We present VLT and Magellan spectroscopy and NTT photometry of nine faint cataclysmic variables (CVs) which were spectroscopically identified by the SDSS. We measure orbital periods for five of these...
Gandhi, P., Makishima, K., Durant, M., Fabian, A. C., Dhillon, V. S., Marsh, T. R., ...
We present the discovery of optical/X-ray flux correlations on rapid timescales in the low/hard state of the Galactic black hole GX 339-4. The source had recently emerged from outburst and was...
GD 552: a cataclysmic variable with a brown dwarf companion? (2008)
Unda-Sanzana, E., Marsh, T. R., Gansicke, B. T., Maxted, P. F. L., Morales-Rueda, L., Dhillon, V. S., ...
GD 552 is a high proper motion star with the strong, double-peaked emission lines characteristic of the dwarf nova class of cataclysmic variable star, and yet no outburst has been detected during the...
On the evolutionary status of short period cataclysmic variables (2008)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gaensicke, B. T., Southworth, John, Baraffe, I., ...
(Abridged) We present high-speed, three-colour photometry of seven short period (Porb
Dillon, M., Gaensicke, B. T., Aungwerojwit, A., Rodriguez-Gil, P., Marsh, T. R., Barros, S. C. C., ...
We present time resolved CCD photometry of 15 cataclysmic variables (CVs) identified by the Sloan Digital Sky Survey (SDSS). The data were obtained as part of the 2004/05 International Time Programme...
1RXSJ173021.5-055933: a cataclysmic variable with a fast-spinning magnetic white dwarf (2008)
De Martino, D., Matt, G., Mukai, K., Falanga, M., Gaensicke, B. T., ...
We present the first X-ray observations with the XMM-Newton and INTEGRAL satellites of the recently discovered cataclysmic variable 1RXSJ173021.5-055933, together with simultaneous UV and coordinated...
1RXS J173021.5-055933: a cataclysmic variable with a fast-spinning magnetic white dwarf (2008)
De Martino, D., Matt, G., Mukai, K., Falanga, M., Gänsicke, B. T., ...
On the orbital period of the magnetic cataclysmic variable HU Aquarii (2008)
Vogel, J., Schwope, A., Schwarz, R., Kanbach, G., Dhillon, V. S., Marsh, T. R.
On the evolutionary status of short-period cataclysmic variables (2008)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gänsicke, B. T., Southworth, John, Baraffe, I., ...
The 2003 Nov 14 occultation by Titan of TYC 1343-1865-1. II. Analysis of light curves (2007)
Zalucha, A., Fitzsimmons, A., Elliot, J. L., Thomas-Osip, J., Hammel, H. B., Dhillon, V. S., ...
We observed a stellar occultation by Titan on 2003 November 14 from La Palma Observatory using ULTRACAM with three Sloan filters: u', g', and i' (358, 487, and 758 nm, respectively). The occultation...
The mass of the white dwarf in the old nova BT Mon (2007)
D. A. Smith, V. S. Dhillon, T. R. Marsh
We present spectrophotometry of the eclipsing old nova BT Mon (Nova Mon 1939). By detecting weak absorption features from the secondary star, we find its radial velocity semi-amplitude to be KR = 205...
On the nature of SW Sex (2007)
We present spectrophotometry of the eclipsing nova-like variable SW Sex. The continuum is deeply eclipsed and shows asymmetries due to the presence of a bright spot. We derive a new ephemeris and, by...
Dhillon Littlefair Howell, V. S. Dhillon, S. P. Littlefair, S. B. Howell, D. R. Ciardi, ...
We present K-band spectra of the short-period dwarf novae YZ Cnc, LY Hya, BK Lyn, T Leo, SW UMa and WZ Sge, the novalike variables DW UMa, V1315 Aql, RW Tri, VY Scl, UU Aqr and GP Com, and a series...
The EUV transient RE J1255+266 (2007)
Watson Marsh Fender, M G Watson, T R Marsh, R P Fender, M A Barstow, M Still, ...
We have identified the optical counterpart of the EUV transient source RE J1255+266 with a 18 magnitude blue star which has an unusual optical spectrum showing a blue continuum and broad Balmer...
Metal-rich debris discs around white dwarfs (2007)
Gaensicke, B. T., Marsh, T. R., Southworth, J., Rebassa-Mansergas, A.
We have identified two moderately hot (~18000-22000K) white dwarfs, SDSSJ1228+1040 and SDSSJ1043+0855, which exhibit double-peaked emission lines in the CaII 8600A triplet. These line profiles are...
Bowen blend echo-tomography of low mass X-ray binaries (2007)
Muñoz-Darias, T., Martinez-Pais, I. G., Casares, J., Cornelisse, R., Dhillon, V. S., Marsh, T. R., ...
We present simultaneous high time resolution (1-10 Hz) X-ray and optical observations of the persistent LMXBs Sco X-1 and V801 Ara(=4U 1636-536). In the case of Sco X-1 we find that the Bowen/HeII...
The long-period AM CVn star SDSS J155252.48+320150.9 (2007)
Roelofs, G. H. A., Groot, P. J., Steeghs, D., Marsh, T. R., Nelemans, G.
The Sloan Digital Sky Survey has been instrumental in obtaining a homogeneous sample of the rare AM CVn stars: mass-transferring binary white dwarfs. As part of a campaign of spectroscopic follow-up...
Southworth, John, Marsh, T. R., Gaensicke, B. T., Aungwerojwit, A., Hakala, P., De Martino, D., ...
Continuing our work from Paper I (Southworth et al., 2006) we present medium-resolution spectroscopy and broad-band photometry of seven cataclysmic variables (CVs) discovered by the SDSS. For six of...
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gaensicke, B. T., Baraffe, I., Watson, C. A.
We present high-speed, three-colour photometry of the eclipsing cataclysmic variable SDSS J150722.30+523039.8 (hereafter SDSS J1507). This system has an orbital period of 66.61 minutes, placing it...
High-Speed Optical Spectroscopy (2007)
The large surveys and sensitive instruments of modern astronomy are turning ever more examples of variable objects, many of which are extending the parameter space to testing theories of stellar...
The binary properties of the pulsating subdwarf B eclipsing binary PG 1336-018 (NY Vir) (2007)
Vučković, M., Aerts, C., Østensen, R., Nelemans, G., Hu, H., Jeffery, C. S., ...
We present an unbiased orbit solution and mass determination of the components of the eclipsing binary NY Vir as a critical test for the formation scenarios of subdwarf B stars. We obtained...
Echoes from the companion star in Sco X-1 (2007)
Muñoz-Darias, T., Martinez-Pais, I. G., Casares, J., Dhillon, V. S., Marsh, T. R., Cornelisse, R., ...
We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow band (Bowen blend/HeII and nearby continuum) observations of Sco X-1 at 2-10 Hz time resolution. We find that the Bowen/HeII...
HST/FGS Parallaxes of AM CVn Stars and Astrophysical Consequences (2007)
Roelofs, G. H. A., Groot, P. J., Benedict, G. F., McArthur, B. E., Steeghs, D., Morales-Rueda, L., ...
We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our parallax measurements...
SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc (2007)
Gaensicke, B. T., Marsh, T. R., Southworth, J.
Intermediate resolution spectroscopy of the white dwarf SDSSJ104341.53+085558.2 contains double-peaked emission lines of CaII8498,8542,8662 and identifies this object to be the second single white...
On the orbital periods of the AM CVn stars HP Librae and V803 Centauri (2007)
Roelofs, G. H. A., Groot, P. J., Nelemans, G., Marsh, T. R., Steeghs, D.
We analyse high-time-resolution spectroscopy of the AM CVn stars HP Librae and V803 Centauri, taken with the New Technology Telescope (NTT) and the Very Large Telescope (VLT) of the European Southern...
ULTRACAM: an ultra-fast, triple-beam CCD camera for high-speed astrophysics (2007)
Dhillon, V. S., Marsh, T. R., Stevenson, M. J., Atkinson, D. C., Kerry, P., Peacocke, P. T., ...
ULTRACAM is a portable, high-speed imaging photometer designed to study faint astronomical objects at high temporal resolutions. ULTRACAM employs two dichroic beamsplitters and three frame-transfer...
SDSS J233325.92+152222.1 and the evolution of intermediate polars (2007)
Southworth, John, Gaensicke, B. T., Marsh, T. R., De Martino, D., Aungwerojwit, A.
Intermediate polars (IPs) are cataclysmic variables which contain magnetic white dwarfs with a rotational period shorter than the binary orbital period. Evolutionary theory predicts that IPs with...
DE CVn: A bright, eclipsing red dwarf - white dwarf binary (2007)
Greimel, R., Morales-Rueda, L., Nelemans, G., Thorstensen, J. R., Marsh, T. R., ...
Close white dwarf - red dwarf binaries must have gone through a common-envelope phase during their evolution. DE CVn is a detached white dwarf - red dwarf binary with a relatively short (~8.7 hours)...
Torres, M. A. P., Jonker, P. G., Steeghs, D., Roelofs, G. H. A., Bloom, J. S., Casares, J., ...
We report on optical and NIR observations obtained during and after the 2004 December discovery outburst of the X-ray transient and accretion-powered millisecond pulsar IGR J00291+5934. Our...
Binary White Dwarfs in the Supernova Ia Progenitor Survey. (2007)
Napiwotzki, R., Karl, C., Nelemans, G., Yungelson, L., Christlieb, N., Drechsel, H., ...
Follow-up Observations of SPY White Dwarf + M-Dwarf Binaries. (2007)
Maxted, P.F.L., Napiwotzki, R., Marsh, T.R., Burleigh, M.R., Dobbie, P.D., Hogan, E., ...
A gaseous metal disk around a white dwarf (2006)
Gaensicke, B. T., Marsh, T. R., Southworth, J., Rebassa-Mansergas, A.
The destiny of planetary systems through the late evolution of their host stars is very uncertain. We report a metal-rich gas disk around a moderately hot and young white dwarf. A dynamical model of...
A brown dwarf mass donor in an accreting binary (2006)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gaensicke, Boris T., Southworth, John, Watson, C. A.
A long standing and unverified prediction of binary star evolution theory is the existence of a population of white dwarfs accreting from sub-stellar donor stars. Such systems ought to be common, but...
ULTRACAM Photometry of the ultracompact binaries V407 Vul and HM Cnc (2006)
Barros, S. C. C., Marsh, T. R., Dhillon, V. S., Groot, P. J., Littlefair, S., Nelemans, G., ...
V407 Vul (RXJ1914.4+2456) and HM Cnc (RXJ0806.3+1527) are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These periods are...
SDSS J0926+3624, the first eclipsing AM CVn star, as seen by ULTRACAM (2006)
Marsh, T. R., Dhillon, V. S., Littlefair, S., Groot, P., Hakala, P., Nelemans, G., ...
We present light curves of SDSS J0926+3624, the first eclipsing AM CVn star, observed with the high-speed CCD camera ULTRACAM on the WHT. We find unusually that the accreting white dwarf is only...
Southworth, John, Gaensicke, B. T., Marsh, T. R., De Martino, D., Hakala, P., Littlefair, S., ...
We present medium-resolution VLT/FORS2 spectroscopy of six cataclysmic variables discovered by the Sloan Digital Sky Survey. We determine orbital periods for SDSS J023322.61+005059.5 (96.08 +/- 0.09...
A search for optical bursts from the rotating radio transient J1819-1458 with ULTRACAM (2006)
Dhillon, V. S., Marsh, T. R., Littlefair, S. P.
We report on the search for optical bursts from J1819-1458, a member of the recently discovered Rotating Radio Transients (RRATs). J1819-1458 exhibits 3 millisecond bursts with a peak flux at 1.4 GHz...
Burleigh, M. R., Marsh, T. R., Gansicke, B. T., Goad, M. R., Dhillon, V. S., Littlefair, S. P., ...
Optical time series photometry of the short period magnetic white dwarf + probable brown dwarf binary SDSS 121209.31+013627.7 reveals pulse-like variability in all bands from i' to u', peaking at u'....
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Gaensicke, B. T.
We present high-speed, three-colour photometry of the eclipsing cataclysmic variable SDSS J170213.26+322954.1 (hereafter SDSS J1702+3229). This system has an orbital period of 2.4 hours, placing it...
Kinematics of the ultra-compact helium accretor AM Canum Venaticorum (2006)
Roelofs, G. H. A., Groot, P. J., Nelemans, G., Marsh, T. R., Steeghs, D.
We report on the results from a five-night campaign of high-speed spectroscopy of the 17-minute binary AM Canum Venaticorum, obtained with the 4.2-m William Herschel Telescope on La Palma. We derive...
GEMINI spectroscopy of the ultra-compact binary candidate V407 Vul (2006)
Steeghs, D., Marsh, T. R., Barros, S. C. C., Nelemans, G., Groot, P. J., Roelofs, G. H. A., ...
We present time-resolved spectroscopy of the optical counterpart to the proposed ultra-compact binary system V407 Vul (=RX J1914.4+2456). Our Gemini spectra resolve the 9.48 minute periodicity that...
Observations of Ultracool dwarfs with ULTRACAM on the VLT: a search for weather (2006)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Shahbaz, T., Martin, E. L.
We present multi-colour photometry of four field ultracool dwarfs with the triple-beam photometer ultracam. Data were obtained simultaneously in the Sloan-g' band and a specially designed narrow-band...
The periodic variations of a white-light flare observed with ULTRACAM (2006)
Mathioudakis, M., Bloomfield, D. S., Jess, D. B., Dhillon, V. S., Marsh, T. R.
High time resolution observations of a white--light flare on the active star EQ PegB show evidence of intensity variations with a period of approximately 10 s. The period drifts to longer values...
Optical spectroscopy of the dwarf nova U Geminorum (2006)
Unda-Sanzana, E., Marsh, T. R., Morales-Rueda, L.
U Gem is unique in having a direct measurement of K1 = 107 +- 2 km/s, Long et al. 1999). We present high-resolution optical spectra of the dwarf nova U Gem in quiescence taken to test the accuracy to...
A ZZCeti white dwarf in SDSSJ133941.11+484727.5 (2006)
Gänsicke, B. T., Rodríguez-Gil, P., Marsh, T. R., De Martino, D., Nestoras, J., Szkody, P., ...
We present time-resolved spectroscopy and photometry of the cataclysmic variable (CV) SDSSJ133941.11+484727.5 (SDSS1339) which has been discovered in the Sloan Digital Sky Survey (SDSS) Data Release...
Burleigh, Matthew R., Marsh, T.R., Gänsicke, B.T., Goad, Michael R., Dhillon, V.S., Littlefair, S.P., ...
Submitted for publication in Monthly Notices of the Royal Astronomical Society by the Royal Astronomical Society and Blackwell Publishing.
A ZZ Ceti white dwarf in SDSS J133941.11+484727.5 (2005)
Gaensicke, B. T., Rodriguez-Gil, P., Marsh, T. R., De Martino, D., Nestoras, J., Szkody, P., ...
We present time-resolved spectroscopy and photometry of the cataclysmic variable (CV) SDSSJ133941.11+484727.5 (SDSS1339) which has been discovered in the Sloan Digital Sky Survey Data Release 4. The...
ULTRACAM photometry of the eclipsing cataclysmic variables GY Cnc, IR Com and HT Cas (2005)
Feline, W. J., Dhillon, V. S., Marsh, T. R., Watson, C. A., Littlefair, S. P.
We present high-speed, three-colour photometry of the eclipsing cataclysmic variables GY Cnc, IR Com and HT Cas. We find that the sharp eclipses in GY Cnc and IR Com are due to eclipses of the white...
Brinkworth, C. S., Marsh, T. R., Dhillon, V. S., Knigge, C.
We present results of high time resolution photometry of the eclipsing pre-cataclysmic variable NN Ser. We observed 13 primary eclipses of NN Ser using the high-speed CCD camera ULTRACAM and derived...
Ultraviolet studies of interacting binaries (2005)
Gaensicke, B. T., De Martino, D., Marsh, T. R., Haswell, C. A., Knigge, C., Long, K. S., ...
Interacting Binaries consist of a variety of stellar objects in different stages of evolution and those containing accreting compact objects still represent a major challenge to our understanding of...
Subdwarf B binaries in the Edinburgh-Cape Survey (2005)
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., Kilkenny, D., O'Donoghue, D.
We give an update of the results of a campaign to obtain orbital solutions of subdwarf B stars from the Edinburgh-Cape survey (Stobie et al. 1997). To date we have obtained blue spectra of 40...
Period Changes in Ultra-compact Double White Dwarfs (2005)
In recent years there has been much interest in the nature of two stars, V407 Vul and RXJ0806+1527, which are widely thought to be binary white dwarfs of very short orbital period, 570 and 321...
Dhillon, V. S., Marsh, T. R., Hulleman, F., Van Kerkwijk, M. H., Shearer, A., Littlefair, S. P., ...
We present high-speed, multi-colour optical photometry of the anomalous X-ray pulsar 4U 0142+61, obtained with ULTRACAM on the 4.2-m William Herschel Telescope. We detect 4U 0142+61 at magnitudes of...
ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence (2005)
Shahbaz, T., Dhillon, V. S., Marsh, T. R., Casares, J., Zurita, C., Charles, P. A., ...
We present high time-resolution multicolour observations of the quiescent soft X-ray transient XTE J1118+480 obtained with ULTRACAM. Superimposed on the double-humped continuum g' and i'-band...
Multiband Echo Tomography of Sco X-1 (2005)
Muñoz-Darias, T., Martínez-Pais, I. G., Casares, J., Marsh, T. R., Cornelisse, R., Steeghs, D., ...
We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII emission lines and a...
Binaries discovered by the SPY project. IV. Five single-lined DA double white dwarfs (2005)
Nelemans, G., Napiwotzki, R., Karl, C., Marsh, T. R., Voss, B., Roelofs, G., ...
We present results from our ongoing follow-up observations of double white dwarf binaries detected in the ESO SN Ia Progenitor SurveY (SPY). We discuss our observing strategy and data analysis and...
SDSS J124058.03-015919.2: A new AM CVn star with a 37-minute orbital period (2005)
Roelofs, G. H. A., Groot, P. J., Marsh, T. R., Steeghs, D., Barros, S. C. C., Nelemans, G.
We present high time resolution VLT spectroscopy of SDSS J124058.03-015919.2, a new helium-transferring binary star identified in the Sloan Digital Sky Survey. We measure an orbital period of...
Six detached white-dwarf close binaries (2005)
Morales-Rueda, L., Maxted, P.F.L., Nelemans, G., Karl, C., Napiwotzki, R., Moran, C.K.J., ...
Cataclysmic variables from a ROSAT/2MASS selection I: Four new intermediate polars (2005)
Gaensicke, B. T., Marsh, T. R., Edge, A., Rodriguez-Gil, P., Steeghs, D., Araujo-Betancor, S., ...
We report the first results from a new search for cataclysmic variables (CVs) using a combined X-ray (ROSAT) / infrared (2MASS) target selection that discriminates against background AGN....
Echo Tomography of Sco X-1 using Bowen Fluorescence Lines (2005)
Casares, J., Muñoz-Darias, T., Martinez-Pais, I. G., Cornelisse, R., Charles, P. A., Marsh, T. R., ...
We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII emission lines were...
Six detached white-dwarf close binaries (2005)
Morales-Rueda, L., Marsh, T. R., Maxted, P. F. L., Nelemans, G., Karl, C., Napiwotzki, R., ...
We determine the orbits of four double degenerate systems (DDs), composed of two white dwarfs, and of two white dwarf -- M dwarf binaries. The four DDs, WD1022+050, WD1428+373, WD1824+040, and...
Binaries discovered by the SPY project - IV. Five single-lined DA double white dwarfs (2005)
Nelemans, G., Napiwotzki, R., Karl, C., Marsh, T.R., Voss, B., Roelofs, G., ...
Binaries discovered by the SPY project IV. Five single-lined DA double white dwarfs. (2005)
Nelemans, G., Napiwotzki, R., Karl, C., Marsh, T.R., Voss, B., Roelofs, G., ...
New Results from the Supernova Ia Progenitor Survey. (2005)
Napiwotzki, R., Karl, C., Nelemans, G., Yungelson, L., Christlieb, N., Drechsel, H., ...
Geometrical constraints upon the unipolar model of V407 Vul and RXJ0806.3+1527 (2004)
Barros, S. C. C., Marsh, T. R., Groot, P., Nelemans, G., Ramsay, G., Roelofs, G., ...
V407 Vul and RX J0806.3+1527 are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These periods and no others are also seen at...
Rotational period of WD1953-011 - a magnetic white dwarf with a star spot (2004)
Brinkworth, C. S., Marsh, T. R., Morales-Rueda, L., Maxted, P. F. L., Burleigh, M. R., Good, S. A.
WD1953-011 is an isolated, cool (7920 +/- 200K, Bergeron, Legget & Ruiz, 2001) magnetic white dwarf (MWD) with a low average field strength (~70kG, Maxted et al. 2000) and a higher than average mass...
Multi-epoch Spectroscopy of IY UMa: Quiescence, Rise, Normal Outburst & Superoutburst (2004)
Rolfe, Daniel J., Haswell, Carole A., Abbott, Timothy M. C., Morales-Rueda, Luisa, Marsh, T. R., Holdaway, G.
We exploit rare observations covering the time before and during a normal outburst in the deeply-eclipsing SU UMa system IY UMa to study the dramatic changes in the accretion flow and emission at the...
Subdwarf B Binaries from the Edinburgh--Cape Survey (2004)
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., Kilkenny, D., O'Donoghue, D.
We present the first results of a campaign to obtain orbital solutions of subdwarf B (sdB) stars from the Edinburgh-Cape survey. We have obtained blue spectra of 35 sdBs, 20 of which have been...
HS2331+3905: The cataclysmic variable that has it all (2004)
Araujo-Betancor, S., Gaensicke, B. T., Marsh, T. R., Harlaftis, E. T., Thorstensen, J., ...
We report detailed follow-up observations of the cataclysmic variable HS2331+3905, identified as an emission-line object in the Hamburg Quasar Survey. An orbital period of 81.08min is unambiguously...
Detection of the white dwarf and the secondary star in the new SU UMa dwarf nova HS 2219+1824 (2004)
Rodriguez-Gil, P., Gaensicke, B. T., Marsh, T. R., Harlaftis, E. T., Kitsionas, S., ...
We report the discovery of a new, non-eclipsing SU UMa-type dwarf nova, HS 2219+1824. Photometry obtained in quiescence (V ~ 17.5) reveals a double-humped light curve from which we derive an orbital...
RX J2130.6+4710 - an eclipsing white dwarf - M-dwarf binary star (2004)
Maxted, P. F. L., Marsh, T. R., Morales-Rueda, L., Barstow, M. A., Dobbie, P. D., Schreiber, M. R., ...
(Abridged) We report the detection of eclipses in the close white-dwarf - M-dwarf binary star RXJ2130.6+4710. We estimate that the spectral type of the M-dwarf is M3.5Ve or M4Ve. We estimate that the...
ULTRACAM photometry of the eclipsing cataclysmic variables XZ Eri and DV UMa (2004)
Feline, W. J., Dhillon, V. S., Marsh, T. R., Brinkworth, C. S.
We present high-speed, three-colour photometry of the faint eclipsing cataclysmic variables XZ Eri and DV UMa. We determine the system parameters through two techniques: first, timings of the eclipse...
Double degenerates and progenitors of supernovae type Ia (2004)
Napiwotzki, R., Yungelson, L., Nelemans, G., Marsh, T. R., Leibundgut, B., Renzini, A., ...
We report on systematic radial velocity surveys for white dwarf - white dwarf binaries (double degenerates - DDs) including SPY (ESO Supernovae Ia progenitor survey) recently carried out at the VLT....
SS433:the microquasar link with ULXs? (2004)
Charles, P. A., Barnes, A. D., Casares, J., Clark, J. S., Clarkson, W. I., Harlaftis, E. T, ...
SS433 is the prototype microquasar in the Galaxy and may even be analogous to the ULX sources if the jets' kinetic energy is taken into account. However, in spite of 20 years of study, our...
Spiral shock detection on eclipse maps: Simulations and Observations (2004)
Harlaftis, E. T., Baptista, R., Morales-Rueda, L., Marsh, T. R., Steeghs, D.
We perform simulations in order to reveal the effect of observational and physical parameters on the reconstruction of a spiral structure in an accretion disk, using eclipse mapping techniques. We...
SS433: The microquasar link with ulxs? (2004)
Barnes , A. D., Casares , J., Charles , P. A., Clark , J. S., Clarkson , W. I., Harlaftis , E. T., ...
SS433 es el microcuasar prototipo de la Galaxia y posiblemente incluso análogo a las fuentes ULX si se tiene en cuenta la energía cinética de los jets". Sin embargo y a pesar de 20 años de...
Close binary white dwarfs and supernovae IA (2004)
Christlieb , N., Drechsel , H., Heber , U., Homeier , D., Karl , C., Koester , D., ...
Informamos sobre el estado actual de los surveys" de velocidades radiales para binarias de enanas blancas (degeneradas dobles - DDs) incluyendo SPY (Exploración ESO de progenitoras de supernovas Ia)...
The mysterious nature of hs 2331+3905 (2004)
Araujo Betancor, S., Engels , D., Fried , R. E., Gansicke , B.T., Hagen , H. J., Harlaftis , E. T., ...
Informamos sobre el descubrimiento de la única variable cataclísmica enana procedente del Hamburg Quasar Survey, HS 2331+3905. Las observaciones obtenidas durante tres años nos revelan un esquema...
Double Degenerate and Progenitors of Supernovae Type Ia. (2004)
Napiwotzki, R., Yungelson, L., Nelemans, G., Marsh, T.R., Leibundgut, B., Renzini, A., ...
Mass Transfer between Double White Dwarfs (2003)
Marsh, T. R., Nelemans, G., Steeghs, D.
Three periodically variable stars have recently been discovered (V407 Vul, P=9.5 min; ES Cet, P=10.3 min; RX J0806.3+1527, P=5.3 min) with properties that suggest that their photometric periods are...
Photometric variability of the unique magnetic white dwarf GD356 (2003)
Brinkworth, C. S., Burleigh, M. R., Wynn, G. A., Marsh, T. R.
GD356 is a magnetic white dwarf (B = 13MG) that uniquely displays weak resolved Zeeman triplets of Halpha and Hbeta in emission. As such, GD356 may be the only known white dwarf with some kind of...
Nelemans, G., Jonker, P. G., Marsh, T. R.
We present optical spectra in the range 4600 -- 8600 A for three low-mass X-ray binaries which have been suggested to belong to the class of ultra-compact X-ray binaries based on their X-ray spectra....
Multicolour observations of V404 Cyg with ULTRACAM (2003)
Shahbaz, T., Dhillon, V.S., Marsh, T.R., Zurita, C., Haswell, Carole, Charles, P.A., ...
We present high-time-resolution multicolour observations of the quiescent soft X-ray transient V404 Cyg obtained with ULTRACAM. Superimposed on the ellipsoidal modulation of the secondary star are...
ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir (2003)
Feline, W. J., Dhillon, V. S., Marsh, T. R., Stevenson, M. J., Watson, C. A., Brinkworth, C. S.
We present high-speed, three-colour photometry of the faint eclipsing cataclysmic variable OU Vir. For the first time in OU Vir, separate eclipses of the white dwarf and bright spot have been...
Multicolour observations of V404 Cyg with ULTRACAM (2003)
Shahbaz, T., Dhillon, V. S., Marsh, T. R., Zurita, C., Haswell, C. A., Charles, P. A., ...
We present high time-resolution multicolour observations of the quiescent soft X-ray transient V404 Cyg obtained with ULTRACAM. Superimposed on the secondary star's ellipsoidal modulation are large...
The orbital period distribution of subdwarf B binaries (2003)
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R.
We present the results of a 3.5 year long campaign to measure orbital periods of subdwarf B (sdB) star binaries. We directly compare our observed orbital period distribution with that predicted by...
Morales-Rueda, L., Marsh, T. R., Steeghs, D., Unda-Sanzana, E., Wood, Janet H., North, R. C.
We present high resolution optical and UV spectra of the 46 min orbital period, helium binary, GP Com. Our data contains simultaneous photometric correction which confirms the flaring behaviour...
Stellar Wind Signatures in sdB Stars (2003)
Heber, U., Maxted, P.F.L., Marsh, T.R., Knigge, C., Drew, J.E.
Stellar wind signatures in sdB stars? (2002)
Heber, U., Maxted, P. F. L., Marsh, T. R., Knigge, C., Drew, J E.
Subdwarf B (sdB) stars form the blue end of the horizonal branch (EHB). Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail to explain these...
Stellar wind signatures in sdB stars? (2002)
Heber, U., Maxted, P. F. L., Marsh, T. R., Knigge, C., Drew, J. E.
Subdwarf B (sdB) stars form the blue end of the horizonal branch. Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail to explain these...
The systemic velocities of four long-period cataclysmic variable stars (2002)
North, R.C., Marsh, T.R., Kolb, U., Dhillon, V.S., Moran, C.K.J.
Although a large number of orbital periods of cataclysmic variable (CV) stars have been measured, comparison of period and luminosity distributions with evolutionary theory is affected by strong...
Search for double degenerate progenitors of supernovae type Ia with SPY (2002)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (SN Ia Progenitor surveY - SPY). About 560...
Knigge, C., Hynes, R. I., Steeghs, D., Long, K. S., Araujo-Betancor, S., Marsh, T. R.
We report the discovery of 15-s oscillations in ultraviolet observations of WZ Sge obtained with the Hubble Space Telescope approximately one month after the peak of the 2001 outburst. This is the...
Search for double degenerate progenitors of supernovae type Ia with SPY (2002)
Napiwotzki, R., Drechsel, H., Heber, U., Karl, C., Christlieb, N., ...
We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY).
New subdwarf B star periods (2002)
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., North, R. C.
Subdwarf B (sdB) stars are thought to be helium burning stars with low mass hydrogen envelopes. Several evolutionary paths have been proposed to explain the formation of these systems. One of these...
Orbital periods of twenty two subdwarf B stars (2002)
Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., North, R. C., Heber, U.
Subdwarf B (sdB) stars are thought to be core helium burning stars with low mass hydrogen envelopes. In recent years it has become clear that many sdB stars lose their hydrogen through interaction...
On the use of 12CO/13CO as a test of common-envelope evolution (2002)
Dhillon, V. S., Littlefair, S. P., Marsh, T. R., Sarna, M. J., Boakes, E. H.
We present K-band echelle spectra of the cataclysmic variable SS Cyg and the pre-cataclysmic variable V471 Tau in order to measure the strengths of the 12CO and 13CO bands at 2.3525 and 2.3448...
PG1115+166 - a long period DA+DB binary (2002)
Maxted, P. F. L., Burleigh, M. R., Marsh, T. R., Bannister, N. P.
We present spectra of the DAB white dwarf PG1115+166. Radial velocity measurements of the Balmer lines and the HeI6678 line show that this is a binary white dwarf with a period of 30.09d in which the...
Search for progenitors of supnernovae type Ia with SPY (2002)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
We have started a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY). About...
Photometry of four binary subdwarf B stars and the nature of their unseen companion stars (2002)
Maxted, P. F. L., Marsh, T. R., Heber, U., Morales-Rueda, L., North, R. C., Lawson, W. A.
We present lightcurves of four binary subdwarf B stars, Ton 245, Feige 11, PG1432+159 and PG1017-086. We also present new spectroscopic data for PG1017-086 from which we derive its orbital period,...
The systemic velocities of four long-period cataclysmic variable stars (2002)
North, R. C., Marsh, T. R., Kolb, U., Dhillon, V. S., Moran, C. K. J.
Although a large number of orbital periods of cataclysmic variable stars (CVs) have been measured, comparison of period and luminosity distributions with evolutionary theory is affected by strong...
The mass ratio distribution of short period double degenerate stars (2002)
Maxted, P. F. L., Marsh, T. R., Moran, C. K. J.
Short period double degenerates (DDs) are close white dwarf - white dwarf binary stars which are the result of the evolution of interacting binary stars. We present the first definitive measurements...
Spectral atlas of dwarf novae in outburst (2002)
Morales-Rueda, L., Marsh, T. R.
Up to now, only a very small number of dwarf novae have been studied during their outburst state (~30 per cent in the Northern hemisphere). In this paper we present the first comprehensive atlas of...
Searching for spiral shocks (2002)
Morales-Rueda, L., Marsh, T. R.
Spiral shocks in cataclysmic variables (CVs) are the result of tidal interactions of the mass donor star with the accretion disc. Their study is fundamental for our understanding of angular momentum...
V407 Vul: a direct impact accretor (2002)
V407 Vul (= RXJ1914.4+2457) shows pulsations in X-ray flux on a period of 9.5 minutes, which have been ascribed to accretion onto a magnetic white dwarf, with the X-ray pulses seen as the accreting...
A first look at cataclysmic variable stars from the 2dF QSO survey (2002)
Marsh, T. R., Morales-Rueda, L., Steeghs, D., Maxted, P., Kolb, U., Et, Al
The 2dF QSO survey is a spectroscopic survey of 48 000 point-sources selected by colour with magnitudes in the range 18.35
Emission from the secondary star in the old cataclysmic variable WZ Sagittae (2001)
Steeghs, D., Marsh, T.R., Knigge, C., Maxted, P.F.L., Kuulkers, E., Skidmore, W.
We present the first detection of the mass donor star in the cataclysmic variable WZ Sagittae. Phase-resolved spectroscopy reveals narrow Balmer emission components from the irradiated secondary star...
The Recurrent Nova U Scorpii - A Type Ia Supernova Progenitor (2001)
Thoroughgood, T. D., Dhillon, V. S., Littlefair, S. P., Marsh, T. R., Smith, D. A.
We derive the mass of the white dwarf in the eclipsing recurrent nova U Sco from the radial velocity semi-amplitudes of the primary and secondary stars. Our results give a high white dwarf mass of...
A first look at cataclysmic variable stars from the 2dF QSO survey (2001)
Marsh, T. R., Morales-Rueda, L., Steeghs, D., Maxted, P., Kolb, U., Boyle, B., ...
The 2dF QSO survey is a spectroscopic survey of 48,000 point-sources selected by colour with magnitudes in the range 18.35 < B < 20.95. Amongst QSOs, white dwarfs, narrow-line galaxies and other...
The mass of the white dwarf in the recurrent nova U Scorpii (2001)
Thoroughgood, T. D., Dhillon, V. S., Littlefair, S. P., Marsh, T. R., Smith, D. A.
We present spectroscopy of the eclipsing recurrent nova U Sco. The radial velocity semi-amplitude of the primary star was found to be K_W = 93 \pm 10 kms^{-1} from the motion of the wings of the...
K-band spectroscopy of the intermediate polar XY Ari (2001)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R.
We present the K-band infrared spectrum of the intermediate polar XY Ari. The spectrum confirms the cataclysmic binary nature of XY Ari, showing emission lines of HeI (2.0587 microns) and the...
Mirror eclipses in the cataclysmic variable IP Peg (2001)
Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Harlaftis, E. T.
We present time resolved K-band infrared spectra of the dwarf nova (DN) IP Peg in early quiescence. The Brackett-gamma and HeI lines in our data show hitherto unseen behaviour, which we term a mirror...
The binary fraction of extreme horizontal branch stars (2001)
Maxted, P. F. L., Heber, U., Marsh, T. R., North, R. C.
(Abbreviated) We have used precise radial velocity measurements of subdwarf-B stars from the Palomar-Green catalogue to look for binary extreme horizontal branch (EHB) stars. We identify 36 EHB stars...
Search for progenitors of supernovae type Ia with SPY (2001)
Napiwotzki, R., Christlieb, N., Drechsel, H., Heber, U., Homeier, D., ...
Halpha-emission doppler tomography of long-period cataclysmic variable stars (2001)
North, R.C., Marsh, T.R., Moran, C.K., Kolb, U., Smith, R.C., Stehle, R.
We present Doppler maps of Halpha (6562.76Å) emission of 4 well-known dwarf novae, SS Cyg, AH Her, EM Cyg and V426 Oph. All 4 systems were in quiescence during our observations. All of them have...
Search for progenitors of supernovae type Ia with SPY. (2001)
Napiwotzki, R., Christlieb, N., Drechsel, H., Hagen, H.J., Heber, U., Homeier, D., ...
‘The definitive version is available at www3.interscience.wiley.com .' Copyright WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim DOI: 10.1002/1521-3994(200112)322:5/63.0.CO;2-I [Full text of this...
Gravitational lensing in eclipsing binary stars (2000)
I consider the effect of the gravitational deflection of light upon the light curves of eclipsing binary stars, focussing mainly upon systems containing at least one white dwarf component. In...
I review the method of Doppler tomography which translates binary-star line profiles taken at a series of orbital phases into a distribution of emission over the binary. I begin with a discussion of...
Mapping the peculiar binary GP Com (2000)
Morales-Rueda, L., Marsh, T. R., North, R. C.
We present high resolution spectra of the AM CVn helium binary GP Com at two different wavelength ranges. The spectra show the same flaring behaviour observed in previous UV and optical data. We find...
KPD1930+2752 - a candidate Type Ia supernova progenitor (2000)
Maxted, P. F. L., Marsh, T. R., North, R. C.
We present spectra of the pulsating sdB star KPD1930+2752 which confirm that this star is a binary. The radial velocities measured from the H-alpha and HeI6678 spectral lines vary sinusoidally with...
Radial velocity measurements of white dwarfs (2000)
Maxted, P. F. L., Marsh, T. R., Moran, C. K. J.
We present 594 radial velocity measurements for 71 white dwarfs obtained during our search for binary white dwarfs and not reported elsewhere. We identify three excellent candidate binaries, which...
WD1953-011 - a magnetic white dwarf with peculiar field structure (2000)
Maxted, P. F. L., Ferrario, L., Marsh, T. R., Wickramasinghe, D. T.
We present H-alpha spectra of the magnetic white dwarf star WD1953-011 which confirm the presence of the broad Zeeman components corresponding to a field strength of about 500kG found by Maxted &...
Dhillon, V. S., Littlefair, S. P., Howell, S. B., Ciardi, D. R., Harrop-Allin, M. K., Marsh, T. R.
We present K-band spectra of the short-period dwarf novae YZ Cnc, LY Hya, BK Lyn, T Leo, SW UMa and WZ Sge, the novalike variables DW UMa, V1315 Aql, RW Tri, VY Scl, UU Aqr and GP Com, and a series...
The triple degenerate star WD1704+481 (2000)
Maxted, P. F. L., Marsh, T. R., Moran, C. K. J., Han, Z.
WD1704+481 is a visual binary in which both components are white dwarfs. We present spectra of the H-alpha line of both stars which show that one component (WD1704+481.2 = Sanduleak B = GR 577) is a...
A mystery solved: the mass ratio of the dwarf nova EM Cygni (1999)
North, R. C., Marsh, T. R., Moran, C. K. J., Kolb, U., Smith, R. C., Stehle, R.
We have discovered that the spectrum of the well-known dwarf nova EM Cyg is contaminated by light from a K2-5V star (in addition to the K-type mass donor star). The K2-5V star contributes...
Spiral structure in IP Pegasi; how persistent is it? (1999)
Morales-Rueda, L., Marsh, T. R., Billington, I.
We present spectroscopy of the dwarf nova IP Pegasi taken during two consecutive nights, 5 and 6 days after the start of an outburst. Even this late in the outburst, Doppler maps show marked spiral...
Orbital periods of the binary sdB stars PG0940+068 and PG1247+554 (1999)
Maxted, P. F. L., Moran, C. K. J., Marsh, T. R., Gatti, A. A.
We have used the radial velocity variations of two sdB stars previously reported to be binaries to establish their orbital periods. They are PG0940+068, (P=8.33d) and PG1247+554 (P=0.599d). The...
Detached white-dwarf close-binary stars -- CV's extended family (1999)
I review detached binaries consisting of white dwarfs with either other white dwarfs or low mass main-sequence stars in tight orbits around them. Orbital periods have been measured for 15 white...
The fraction of double degenerates among DA white dwarfs (1999)
Maxted, P. F. L., Marsh, T. R.
We present the results of a radial velocity survey designed to measure the fraction of double degenerates among DA white dwarfs. The narrow core of the H-alpha line was observed twice or more for 46...
Kinematics of the helium accretor GP Com (1998)
We present time-resolved spectra of the double-degenerate binary star, GP Com. The spectra confirm the presence and period (46.5 min) of the `S'-wave feature found by Nather, Robinson and Stover. GP...
The separation of the stars in the binary nucleus of the planetary nebula Abell 35 (1998)
Gatti, A. A., Drew, J. E., Oudmaijer, R. D., Marsh, T. R., Lynas-Gray, A. E.
Using the Planetary Camera on board the Hubble Space Telescope we have measured the projected separation of the binary components in the nucleus of the planetary nebula Abell 35 to be larger than...
The mass and radius of the M dwarf companion to GD 448 (1998)
Maxted, P. F. L., Marsh, T. R., Moran, C., Dhillon, V. S., Hilditch, R. W.
We present spectroscopy and photometry of GD 448, a detached white dwarf - M dwarf binary with a period of 2.47h. We find that the NaI 8200A feature is composed of narrow emission lines due to...
A double-frequency dwarf nova oscillation (1998)
We have detected coherent oscillations (``dwarf nova oscillations'') in Hubble Space Telescope spectra of the dwarf nova OY Car. The oscillations were seen towards the end of a superoutburst of OY...
A new magnetic white dwarf : PG2329+267 (1998)
Moran, C., Marsh, T. R., Dhillon, V. S.
We have discovered that the white dwarf PG 2329+267 is magnetic, and assuming a centered dipole structure, has a dipole magnetic field strength of approximately 2.3MG. This makes it one of only...
Maxted, P. F. L., Marsh, T. R.
The white dwarf stars WD1614+136 and WD1353+409 are not sufficiently massive to have formed through single star evolution. However, observations to date have not yet found any evidence for binarity....
The separation of the stars in the binary nucleus of the planetary nebula Abell 35. (1998)
Gatti, A.A., Drew, J.E., Oudmaijer, R.D., Marsh, T.R., Lynas-Gray, A.E.
The mass of the white dwarf in the old nova BT Mon (1997)
Smith, D. A., Dhillon, V. S., Marsh, T. R.
We present spectrophotometry of the eclipsing old nova BT Mon (Nova Mon 1939). By detecting weak absorption features from the secondary star, we find its radial velocity semi-amplitude to be K_R =...
On the nature of SW Sex (1997)
Dhillon, V. S., Marsh, T. R., Jones, D. H. P.
We present spectrophotometry of the eclipsing nova-like variable SW Sex. The continuum is deeply eclipsed and shows asymmetries due to the presence of a bright spot. We derive a new ephemeris and, by...
A detached double degenerate with a 1.4 hr orbital period (1997)
Moran, C., Marsh, T. R., Bragaglia, A.
We have discovered that the detached double degenerate binary WD 0957-666 has an orbital period of 1.46 hours, rather than the 1.15 day orbital period reported earlier. This is the shortest period...
Infrared spectroscopy of cataclysmic variables - II. Intermediate polars (1996)
Dhillon, V. S., Marsh, T. R., Duck, S. R., Rosen, S. R.
We present infrared (0.97-2.45 micron) spectra of the intermediate polars PQ Gem (RE0751+14), BG CMi and EX Hya. The spectra show strong Paschen, Brackett and HeI emission lines from the accretion...
OY Car in Outburst: Balmer emission from the red star and the gas stream (1995)
Harlaftis, E. T., Marsh, T. R.
We present observations of OY Car, obtained with the Anglo-Australian telescope, during a normal outburst in 1991. Two sinusoidal components are resolved in the Hbeta trailed spectra and we determine...
The Discovery of a Short Period Double-Degenerate Binary Star (1995)
We have found that the white dwarf PG 1101+364 is a double-lined white dwarf/white dwarf binary with an orbital period of 3.47 hours. PG 1101+364 is the shortest period detached double-degenerate yet...
OY Car During Normal Outburst: Balmer Emission From The Red Star And The Gas Stream (1995)
Harlaftis, E. T., Marsh, T. R.
We present observations of OY Car, obtained with the Anglo-Australian Telescope, during a normal outburst in August 1991. Two sinusoidal components are resolved in the H$\beta$ trailed spectra and we...
An observational test of common-envelope evolution (1995)
Sarna, M. J., Dhillon, V. S., Marsh, T. R., Marks, P. B.
By analysing and modelling the change in the abundance ratio of $^{12}$C/$^{13}$C and $^{16}$O/$^{17}$O on the surface of the lower mass star of a binary during the common-envelope (CE) phase of...