Long-term photometry and periods for 261 nearby pulsating M giants (2009)
Tabur, V., Bedding, T. R., Kiss, L. L., Moon, T. T., Szeidl, B., Kjeldsen, H.
We present the results of a 5.5-year CCD photometric campaign that monitored 261 bright, southern, semi-regular variables with relatively precise Hipparcos parallaxes. The data are supplemented with...
Kiss, L. L., Monnier, J. D., Bedding, T. R., Tuthill, P., Zhao, M., Ireland, M. J., ...
We have obtained H-band interferometric observations of three galactic red supergiant stars using the MIRC instrument on the CHARA array. The targets include AZ Cyg, a field RSG and two members of...
Binarity and multiperiodicity in high-amplitude delta Scuti stars (2008)
Derekas, A., Kiss, L. L., Bedding, T. R., Ashley, M. C. B., Csak, B., Danos, A., ...
We have carried out a photometric and spectroscopic survey of bright high-amplitude delta Scuti (HADS) stars. The aim was to detect binarity and multiperiodicity (or both) in order to explore the...
The Young, Massive, Star Cluster Sandage-96 After the Explosion of SN 2004dj in NGC 2403 (2008)
Vinko, J., Sarneczky, K., Balog, Z., Immler, S., Sugerman, B. E. K., Brown, P. J., ...
The bright Type II-plateau supernova (SN) 2004dj occurred within the young, massive stellar cluster Sandage-96 in a spiral arm of NGC 2403. New multi-wavelength observations obtained with several...
Star cluster kinematics with AAOmega (2008)
Kiss, L. L., Balog, Z., Szabo, Gy. M., Parker, Q. A., Frew, D. J.
The high-resolution setup of the AAOmega spectrograph on the Anglo-Australian Telescope makes it a beautiful radial velocity machine, with which one can measure velocities of up to 350-360 stars per...
Kiss, L. L., Szabo, Gy. M., Balog, Z., Parker, Q. A., Frew, D. J.
We present new radial velocity measurements of 586 stars in a one-degree field centered on the open cluster M46, and the planetary nebula NGC 2438 located within a nuclear radius of the cluster. The...
Cometary activity at 25.7 AU: Hale--Bopp 11 years after perihelion (2008)
Szabo, Gy. M., Kiss, L. L., Sarneczky, K.
Eleven years after its perihelion, comet C/1995 O1 (Hale-Bopp) is still active. Between October 20--22, 2007, we detected a diffuse coma of 180x10^3$km in diameter with a slight elongation toward N/S...
Christiansen, J. L., Derekas, A., Kiss, L. L., Ashley, M. C. B., Curran, S. J., Hamacher, D. W., ...
We present a new catalogue of variable stars compiled from data taken for the University of New South Wales Extrasolar Planet Search. From 2004 October to 2007 May, 25 target fields were each...
High and low states of the system AM Herculis (2008)
Context: We investigate the distribution of optically high and low states of the system AM Herculis (AM Her). Aims: We determine the state duty cycles, and their relationships with the mass transfer...
Combining Visual and Photoelectric Observations of Semi-Regular Red Variables (2007)
Moon, T. T., Otero, S. A., Kiss, L. L.
Combining visual observations of SR variables with measurements of them using a photoelectric photometer is discussed then demonstrated using data obtained for the bright, southern SR variable theta...
Oscillations in Procyon A: First results from a multi-site campaign (2007)
Hekker, S., Arentoft, T., Kjeldsen, H., Bedding, T. R., Christensen-Dalsgaard, J., Reffert, S., ...
Procyon A is a bright F5IV star in a binary system. Although the distance, mass and angular diameter of this star are all known with high precision, the exact evolutionary state is still unclear....
The first high-amplitude delta Scuti star in an eclipsing binary system (2007)
Christiansen, J. L., Derekas, A., Ashley, M. C. B., Webb, J. K., Hidas, M. G., Hamacher, D. W., ...
We report the discovery of the first high-amplitude delta Scuti star in an eclipsing binary, which we have designated UNSW-V-500. The system is an Algol-type semi-detached eclipsing binary of maximum...
ESC and KAIT Observations of the Transitional Type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at...
Radial velocities of five globular clusters obtained with AAOmega (2007)
Székely, P., Kiss, L. L., Szatmáry, K., Csák, B., Bakos, G. Á., Bedding, T. R.
Using the recently commissioned multi-object spectrograph AAOmega on the 3.9m AAT we have obtained medium-resolution near-infrared spectra for 10,500 stars in and around five southern globular...
Bruntt, H., Stello, D., Suarez, J. C., Arentoft, T., Bedding, T. R., Bouzid, M. Y., ...
We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time series from eight sites using nine 0.6-2.1 meter telescopes...
A wide-field kinematic survey for tidal tails around five globular clusters (2007)
Kiss, L. L., Szekely, P., Bedding, T. R., Bakos, G. A., Lewis, G. F.
Using the AAOmega instrument of the Anglo-Australian Telescope, we have obtained medium-resolution near-infrared spectra of 10,500 stars in two-degree fields centered on the galactic globular...
Derekas, A., Kiss, L. L., Bedding, T. R.
Eclipsing binaries offer a unique opportunity to determine fundamental physical parameters of stars using the constraints on the geometry of the systems. Here we present a reanalysis of publicly...
ESC and KAIT Observations of the Transitional Type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at...
Solar-like oscillations in open cluster stars (2007)
Stello, D., Bruntt, H., Arentoft, T., Gilliland, R. L., Nuspl, J., ...
Asteroseismology of stellar clusters is potentially a powerful tool. The assumption of a common age, distance, and chemical composition provides constraints on each cluster member, which...
Stello, D., Bruntt, H., Kjeldsen, H., Bedding, T. R., Arentoft, T., Gilliland, R. L., ...
Measuring solar-like oscillations in an ensemble of stars in a cluster, holds promise for testing stellar structure and evolution more stringently than just fitting parameters to single field stars....
Physical parameters and multiplicity of five southern close eclipsing binaries (2007)
Szalai, T., Kiss, L. L., Meszaros, Sz., Vinko, J., Csizmadia, Sz.
Aims: Detect tertiary components of close binaries from spectroscopy and light curve modelling; investigate light-travel time effect and the possibility of magnetic activity cycles; measure...
ESC and KAIT observations of the transitional type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
Kiss, L. L., Derekas, A., Szabo, Gy. M., Bedding, T. R., Szabados, L.
We analyse public domain time-series photometric observations of 30 known and candidate binary post-AGB stars for measuring pulsation and orbital periods. We derive periodicities for 17 stars for the...
RR Lyrae stars in the southern globular cluster NGC 362 (2006)
Szekely, P., Kiss, L. L., Jackson, R., Derekas, A., Csak, B., Szatmary, K.
NGC 362 is a bright southern globular cluster for which no extensive variability survey has ever been done. Time-series CCD photometric observations have been obtained. Light curves have been derived...
Eclipsing binaries in the LMC: a wealth of data for astrophysical tests (2006)
Derekas, A., Kiss, L. L., Bedding, T. R.
We have analysed publicly available MACHO observations of 6833 variable stars in the Large Magellanic Cloud, classified as eclipsing binaries. After finding that a significant fraction of the sample...
Multi-site campaign on the open cluster M67. I. Observations and photometric reductions (2006)
Stello, D., Arentoft, T., Bedding, T. R., Bouzid, M. Y., Bruntt, H., Csubry, Z., ...
We report on an ambitious multi-site campaign aimed at detecting stellar variability, particularly solar-like oscillations, in the red giant stars in the open cluster M67 (NGC 2682). During the...
Ellipsoidal Variability and Long Secondary Periods in MACHO Red Giant Stars (2006)
Derekas, A., Kiss, L. L., Bedding, T. R., Kjeldsen, H., Lah, P., Szabo, Gy. M.
We present a period-luminosity-amplitude analysis of 5899 red giant and binary stars in the Large Magellanic Cloud, using publicly available observations of the MACHO project. For each star, we...
Variability in red supergiant stars: pulsations, long secondary periods and convection noise (2006)
Kiss, L. L., Szabo, Gy. M., Bedding, T. R.
We study the brightness variations of galactic red supergiant stars using long-term visual light curves collected by the American Association of Variable Star Observers (AAVSO) over the last century....
VZ Velorum: 116 years of a Mira star (2006)
Using the Harvard College Observatory Photographic Plate Collection and recent CCD observations by the ASAS project we have reconstructed the light variations of the southern pulsating red giant star...
Nearby debris disk systems with high fractional luminosity reconsidered (2006)
Moor, A., Abraham, P., Derekas, A., Kiss, Cs., Kiss, L. L., Apai, D., ...
By searching the IRAS and ISO databases we compiled a list of 60 debris disks which exhibit the highest fractional luminosity values (fd>10^-4) in the vicinity of the Sun (d5x10^-4 are younger than...
Green, E. M., O'Donoghue, D., Kiss, L. L., Randall, S. K., Fontaine, G., ...
In the first spectroscopic campaign for a PG 1716 variable (or long-period pulsating subdwarf B star), we succeeded in detecting velocity variations due to g-mode pulsations at a level of 1.0-1.5...
Nearby debris disk systems with high fractional luminosity reconsidered (2006)
Moór, A., Ábrahám, P., Derekas, A., Kiss, Cs, Kiss, L. L., Apai, D., ...
By searching the IRAS and ISO databases, we compiled a list of 60 debris disks that exhibit the highest fractional luminosity values (fd>10-4) in the vicinity of the Sun (d5×10-4 are younger than...
Red giant variables: OGLE--II and MACHO (2005)
We review the recent impact of microlensing projects on our understanding of pulsating red giant stars. Discussed are red giant stars' pulsation properties (period--luminosity relations, period...
Binarity and multiperiodicity in high-amplitude delta Scuti stars (2005)
Derekas, A., Kiss, L. L., Csak, B., Griffin, J., Lindstrom, C., Meszaros, Sz., ...
We present our first results for a sample of southern high-amplitude delta Scuti stars (HADS), based on a spectrophotometric survey started in 2003. For CY Aqr and AD CMi, we found very stable light...
A comprehensive survey of variable stars in the globular cluster NGC 362 (2005)
Székely, P., Kiss, L. L., Csák, B., Derekas, A., Bedding, T. R., Szatmáry, K.
We present the first results of our variability survey for the globular cluster NGC 362. We found numerous variable stars in the field including 23 RR Lyr stars, 4 eclipsing binaries and 5 other...
Lindstrom, C., Griffin, J., Kiss, L. L., Uemura, M., Derekas, A., Meszaros, Sz., ...
We present spectroscopic observations of the black-hole binary V4641 Sagittarii, obtained between 4th July 2004 and 28th March 2005, which cover the minor outburst of the star in early July 2004 and...
Bedding, T. R., Kiss, L. L., Kjeldsen, H., Brewer, B. J., Dind, Z. E., Kawaler, S. D., ...
We analyse visual observations of the pulsations of the red giant variable L2 Pup. The data cover 77 years between 1927 and 2005, thus providing an extensive empirical base for characterizing...
CCD photometry of 23 minor planets (2005)
Székely, P., Kiss, L. L., Szabó, Gy. M., Sárneczky, K., Csák, B., Váradi, M., ...
We present CCD photometric observations of 23 main-belt asteroids, of which 8 have never been observed before thus the data of these objects are the first in the literature. The majority showed well...
Lah, P., Kiss, L. L., Bedding, T. R.
We present an analysis of the 3-D structure of the Magellanic Clouds, using period-luminosity (P-L) relations of pulsating red giants in the OGLE-II sample. By interpreting deviations from the mean...
We investigate blending, binarity and photometric biases in crowded-field CCD imaging. For this, we consider random blend losses, which correspond to the total number of stars left undetected in...
Distance of the Hypernova SN 2002ap via the Expanding Photosphere Method (2004)
Vinko, J., Blake, R. M., Sarneczky, K., Csak, B., Furesz, G., Csizmadia, Sz., ...
New optical photometric and spectroscopic data of the bright hypernova SN 2002ap are presented. The obtained BVRI light curves as well as the optical spectra agree well with other published data...
The 2004--2006 outburst and environment of V1647 Ori (2004)
Acosta-Pulido, J. A., Kun, M., Abraham, P., Kospal, A., Csizmadia, Sz., Kiss, L. L., ...
(Abridged) We studied the brightness and spectral evolution of the young eruptive star V1647 Ori during its recent outburst in the period 2004 February - 2006 Sep. We performed a photometric...
Spectroscopic monitoring of the transition phase in nova V4745 Sgr (2004)
Csak, B., Kiss, L. L., Retter, A., Jacob, A., Kaspi, S.
We present a spectroscopic monitoring of the transient nova V4745 Sagittarii (Nova Sgr 2003 #1) covering ten months after the discovery. During this period the light curve showed well expressed...
A first-overtone RR Lyrae star with cyclic period changes (2004)
Derekas, A., Kiss, L. L., Udalski, A., Bedding, T. R., Szatmary, K.
A detailed light curve analysis is presented for a first-overtone RR Lyrae star, MACHO* J050918.712-695015.31, based on MACHO and OGLE-III observations. As a foreground object of the Large Magellanic...
On the close optical companion of V1494 Aql: problems with light curve modelling (2003)
Kiss, L. L., Csak, B., Derekas, A.
New observations of the eclipsing nova V1494 Aql were analysed in order to estimate the effect of the optical companion located 1.4 arcsec southwest. R and I-band images (stellar FWHM~1.2-1.4 arcsec)...
We present period-luminosity relations for more than 3,200 red variable stars in the Small Magellanic Cloud observed in the second phase of the Optical Gravitational Lensing Experiment (OGLE-II)....
Color Variability of Asteroids in SDSS Moving Object Catalog (2003)
Szabo, G., Ivezic, Z., Juric, M., Lupton, R. H., Kiss, L. L.
We report a detection of statistically significant color variations for a sample of 7,531 multiply observed asteroids that are listed in the Sloan Digital Sky Survey Moving Object Catalog. Using...
The first CCD photometric study of the open cluster NGC 2126 (2003)
Gaspar, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, Cs., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~57 hours. Almost 1000...
We present period-luminosity relations for more than 23,000 red giants in the Large Magellanic Cloud observed by the OGLE-II microlensing project. The OGLE period values were combined with the 2MASS...
Oscillations in Arcturus from WIRE photometry (2003)
Retter, A., Bedding, T., Buzasi, D. L., Kjeldsen, H., Kiss, L. L.
Observations of the red giant Arcturus (Alpha Boo) obtained with the star tracker on the Wide Field Infrared Explorer (WIRE) satellite during a baseline of 19 successive days in 2000 July-August are...
Derekas, A., Kiss, L. L., Szekely, P., Alfaro, E. J., Csak, B., Meszaros, Sz., ...
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our...
Derekas, A., Kiss, L. L., Székely, P., Alfaro, E. J., Csák, B., Mészáros, Sz., ...
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our...
VRI CCD photometry of NGC 2126 (2003)
Gáspár, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, C., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~57 hours. Almost 1000...
The first CCD photometric study of the open cluster NGC 2126 (2003)
Gáspár, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, Cs., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~ 57 hours. Almost...
The He-shell flash in action: T Ursae Minoris revisited (2002)
Szatmary, K., Kiss, L. L., Bebesi, Zs.
We present an updated and improved description of the light curve behaviour of T Ursae Minoris, which is a Mira star with the strongest period change (the present rate is an amazing -3.8+/-0.4...
Kiss, L. L., Derekas, A., Meszaros, Sz., Szekely, P.
We present the first results of an observational project, which addresses the period changing behaviour of a sample of high-amplitude delta Scuti stars. In this paper we discuss the double-mode...
The multimode pulsation of the delta Scuti star V784 Cassiopeae (2002)
Kiss, L. L., Derekas, A., Alfaro, E. J., Biro, I. B., Csak, B., Garrido, R., ...
We present an analysis of new Johnson and Stromgren photometric and medium-resolution spectroscopic observations of the delta Scuti type variable star V784 Cassiopeae. The data were obtained in three...
Wind Accretion and State Transitions in Cygnus X-1 (2002)
Gies, D. R., Bolton, C. T., Thomson, J. R., Huang, W., McSwain, M. V., Riddle, R. L., ...
We present the results of a spectroscopic monitoring program (from 1998 to 2002) of the H-alpha emission strength in HDE 226868, the optical counterpart of the black hole binary, Cyg X-1. The H-alpha...
Period-doubling events in the light curve of R Cygni: evidence for chaotic behaviour (2002)
A detailed analysis of the century long visual light curve of the long-period Mira star R Cygni is presented and discussed. The data were collected from the publicly available databases of the AFOEV,...
Nova Cygni 2001/2 = V2275 Cyg (2002)
Kiss, L. L., Gogh, N., Vinko, J., Furesz, G., Csak, B., DeBond, H., ...
We present an analysis of low- and medium resolution spectra of the very fast nova, Nova Cygni 2001/2 (V2275 Cyg) obtained at nine epochs in August, September and October, 2001. The expansion...
Spectrophotometry and structural analysis of 5 comets (2002)
Szabo, Gy. M., Kiss, L. L., Sarneczky, K., Sziladi, K.
We discuss the morphology and spectrophotometry of 5 comets visible in August, 2001. We decompose comae into coma profiles and azimuthally renormalized images, in which general and local features are...
A variable star survey of the open cluster M37 (2001)
Kiss, L. L., Szabo, Gy., Sziladi, K., Furesz, G., Sarneczky, K., Csak, B.
A CCD photometric study of the dense galactic open cluster M37 is presented and discussed. The majority of the analysed data are time-series measurements obtained through an R_C filter. The...
Photometric observations of 9 Near-Earth Objects (2001)
Szabo, Gy., Csak, B., Sarneczky, K., Kiss, L. L.
We present new CCD observations of nine Near-Earth Asteroids carried out between February, 1999 and July, 2000. The bulk of the data was acquired through an R_C filter, while the minor planet 11405...
Photometric observations of distant active comets (2001)
Szabo, Gy., Csak, B., Sarneczky, K., Kiss, L. L.
We present CCD VR_C observations of 6 distant comets located at heliocentric distances of 3.4--7.2 AU. Time-series data were obtained on three nights in July, 2000 covering 16 hours. Each comet was...
Distance to the Active Galaxy NGC 6951 via the Type Ia Supernova 2000E (2001)
Vinko, J., Csak, B., Csizmadia, Sz., Furesz, G., Kiss, L. L., Sarneczky, K., ...
CCD-photometry and low-resolution spectroscopy of the bright supernova SN 2000E in NGC 6951 are presented. Both the light curve extending up to 150 days past maximum and the spectra obtained at 1...
The Peculiar Type Ia Supernova 1999by: Spectroscopy at Early Epochs (2001)
Vinko, J., Kiss, L. L., Csak, B., Furesz, G., Szabo, R., Thomson, J. R., ...
We present medium resolution (lambda/Delta lambda = 2500) optical spectroscopy of SN 1999by in NGC 2841 made around its light maximum. The depth ratio of the two Si II features at 5800 AA and 6150 AA...
The radial pulsation of AI Aurigae (2001)
We present an analysis of eleven years of Stromgren by photometry of the red semiregular variable star AI Aurigae. An early period determination of 63.9 days is confirmed by the long-term light curve...
J. Vinkó, B. Csák, Sz. Csizmadia, G. Fürész, L. L. Kiss, ...
Abstract. CCD-photometry and low-resolution spectroscopy of the bright supernova SN 2000E in NGC 6951 are presented. Both the light curve extending up to 150 days past maximum and the spectra...
The 2000 outburst of the recurrent nova CI Aquilae: optical spectroscopy (2000)
Kiss, L. L., Thomson, J. R., Ogloza, W., Furesz, G., Sziladi, K.
We present low- and medium resolution spectra of the recurrent nova CI Aquilae taken at 14 epochs in May and June, 2000. The overall appearance is similar to other U Sco-type recurrent novae (U Sco,...
Spectrophotometry and period analysis of the sdB eclipsing binary HW Virginis (2000)
Kiss, L. L., Csak, B., Szatmary, K., Furesz, G., Sziladi, K.
New CCD observations of the pre-cataclysmic binary HW Virginis are presented and discussed. The R-filtered CCD photometry was supplemented with medium-band (Cousins VRI) spectrophotometry based on...
A comparison of light and velocity variations in Semiregular variables (2000)
Lebzelter, T., Kiss, L. L., Hinkle, K. H.
NIR velocity variations are compared with simultaneous visual light curves for a sample of late-type semiregular variables (SRV). Precise radial velocity measurements are also presented for the SRV...
Multiperiodicity in semiregular variables II. Systematic amplitude variations (2000)
Kiss, L. L., Szatmary, K., Szabo, Gy., Mattei, J. A.
We present a detailed lightcurve analysis for a sample of bright semiregular variables based on long-term (70--90 years) visual magnitude estimates carried out by amateur astronomers. Fundamental...
HV Ursae Majoris, a new contact binary with early-type components (2000)
Csak, B., Kiss, L. L., Vinko, J., Alfaro, E. J.
We present the first UBV and uvby photometric observations for the short period variable star HV Ursae Majoris classified as a field RRc variable. The observed differences between the consecutive...
Early spectroscopic observations of Nova (V1494) Aquilae 1999 No.2 (2000)
Low- and medium resolution spectra of the fast nova, Nova (V1494) Aql 1999 No.2 obtained approximately 6, 7, 19 and 28 days after the maximum brightness are presented and discussed. The spectrum...
We present new high-resolution (R=40000) spectroscopic observations of 18 bright northern Cepheids carried out at David Dunlap Observatory, in 1997. The measurements mainly extend those of presented...
CCD photometry and new models of 5 minor planets (1999)
Kiss, L. L., Szabo, Gy., Sarneczky, K.
We present new R filtered CCD observations of 5 faint and moderately faint asteroids carried out between October, 1998 and January, 1999. The achieved accuracy is between 0.01-0.03 mag, depending...
Multiperiodicity in semiregular variables - I. General properties (1999)
Kiss, L. L., Szatmary, K., Cadmus Jr., R. R., Mattei, J. A.
We present a detailed period analysis for 93 red semiregular variables by means of Fourier and wavelet analyses of long-term visual observations carried out by amateur astronomers. The results of...
Early-time spectroscopic observations of SN 1998aq in NGC 3982 (1999)
Vinko, J., Kiss, L. L., Thomson, J., Furesz, G., Lu, W., Kaszas, G., ...
Medium resolution spectroscopic observations of SN 1998aq made in April-May, 1998, are presented. We confirm its Type Ia classification based on the prominent Si II 6355 A line and other features...
V2109 Cygni, a second overtone field RR Lyrae star (1999)
Kiss, L. L., Csak, B., Thomson, J. R., Vinko, J.
We present the first (as of February, 1999) UBV and uvby photometric measurements for the short period variable star V2109 Cyg discovered by the Hipparcos satellite and classified as a field RRc...