A census of AM CVn stars: three new candidates and one confirmed 48.3-minute binary (2009)
Rau, Arne, Roelofs, Gijs H. A., Groot, Paul J., Marsh, Tom R., Nelemans, Gijs, Steeghs, Danny, ...
We present three new candidate AM CVn binaries, plus one confirmed new system, from a spectroscopic survey of color-selected objects from the Sloan Digital Sky Survey. All four systems were found...
A New Dynamical Model for the Black Hole Binary LMC X-1 (2008)
Orosz, Jerome A., Steeghs, Danny, McClintock, Jeffrey E., Torres, Manuel A. P., Bochkov, Ivan, Gou, Lijun, ...
We present a dynamical model of the high mass X-ray binary LMC X-1 based on high-resolution optical spectroscopy and extensive optical and near-infrared photometry. From our new optical data we find...
V2051 Oph after superoutburst: out-of-plane material and the superhump light source (2008)
Papadaki, Christina, Boffin, Henri M. J., Steeghs, Danny, Schmidtobreick, Linda
We performed a detailed spectroscopic analysis of the dwarf nova V2051 Oph at the end of its 1999 superoutburst. We studied and interpreted the simultaneous behaviour of various emission lines. We...
IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery (2008)
Vink, Jorick S., Drew, Janet E., Steeghs, Danny, Wright, Nick J., Martin, Eduardo L., Gaensicke, Boris T., ...
We report on the discovery of over 50 strong Halpha emitting objects towards the large OB association Cyg OB2 and the HII region DR 15 on its southern periphery. This was achieved using the INT...
An Overview of the Bowen Survey; detecting donor star signatures in Low Mass X-ray Binaries (2008)
Cornelisse, Remon, Casares, Jorge, Munoz-Darias, Teo, Steeghs, Danny, Charles, Phil, Hynes, Rob, ...
In this paper we give a review of the Bowen fluorescence survey, showing that narrow emission lines (mainly NIII and CIII lines between 4630 and 4660 A) appear to be universally present in the Bowen...
This report concerns interacting binary stars called cataclysmic variables, or CVs. Two different projects, one more theoretically inclined while the other concerns new observations of CVs, are...
XMM-Newton observations of AM CVn binaries: V396 Hya & SDSS J1240-01 (2006)
Ramsay, Gavin, Groot, Paul J., Marsh, Tom, Nelemans, Gijs, Steeghs, Danny, Hakala, Pasi
We present the results of XMM-Newton observations of two AM CVn systems - V396 Hya and SDSS J1240-01. Both systems are detected in X-rays and in the UV: neither shows coherent variability in their...
Cooper, Randall L., Mukhopadhyay, Banibrata, Steeghs, Danny, Narayan, Ramesh
(abridged) We have investigated the physical conditions under which accreting neutron stars can both produce and preserve sufficient quantities of carbon fuel to trigger superbursts. Our models span...
XMM-Newton observations of AM CVn binaries (2005)
Ramsay, Gavin, Hakala, Pasi, Marsh, Tom, Nelemans, Gijs, Steeghs, Danny, Cropper, Mark
We present the results of XMM-Newton observations of four AM CVn systems -- AM CVn, CR Boo, HP Lib and GP Com. Their light curves show very different characteristics. The X-ray light curves show no...
Krauss, Miriam I., Wang, Zhongxiang, Dullighan, Allyn, Juett, Adrienne M., Kaplan, David L., Chakrabarty, Deepto, ...
We report the precise optical and X-ray localization of the 3.2 ms accretion-powered X-ray pulsar XTE J1814-338 with data from the Chandra X-Ray Observatory as well as optical observations conducted...
Spectroscopy and near-infrared photometry of the helium nova V445 Puppis (2004)
Woudt, Patrick A., Steeghs, Danny
Nova Puppis 2000 (V445 Pup) has been proposed as the first example of a helium nova. Recent optical spectroscopy of V445 Pup at V=19.91 mag obtained with IMACS on the 6.5-m Magellan telescope, shows...
Homan, Jeroen, Miller, Jon M., Wijnands, Rudy, Van Der Klis, Michiel, Belloni, Tomaso, Steeghs, Danny, ...
We present a variability study of the black hole candidate and X-ray transient H1743-322 during its 2003/2004 outburst. We analyzed five Rossi X-ray Timing Explorer observations that were performed...
First results from multi-wavelength observations during the 2001 outburst of WZ Sge (2001)
Kuulkers, Erik, Knigge, Christian, Steeghs, Danny, Wheatley, Peter J., Long, Knox S.
WZ Sge has shown superoutbursts in 1913, 1946 and 1978. On 2001 July 23 a new outburst was announced, about 10 years `too early'. Target of opportunity satellite observations with Chandra, FUSE, HST...
The Quiescent Spectrum of the AM CVn star CP Eri (2001)
Groot, Paul J., Nelemans, Gijs, Steeghs, Danny, Marsh, Tom
We used the 6.5m MMT to obtain a spectrum of the AM CVn star CP Eri in quiescence. The spectrum is dominated by He I emission lines, which are clearly double peaked with a peak-to-peak separation of...
The mass donor of Scorpius X-1 revealed (2001)
Steeghs, Danny, Casares, Jorge
We present the first detection of the mass donor star in the prototype X-ray binary Scorpius X-1. Phase resolved spectroscopy revealed narrow emission lines components from the irradiated secondary...
Multi-epoch Doppler tomography and polarimetry of QQ Vul (1999)
Schwope, A. D., Catalan, Maria S., Beuermann, Klaus, Metzner, Andre, Smith, Robert Connon, Steeghs, Danny
(abridged abstract) We present multi-epoch high-resolution spectroscopy and photoelectric polarimetry of the long-period polar (AM Herculis star) QQ Vul. The blue emission lines show several distinct...
On the observability of spiral structures in CV accretion discs (1999)
Steeghs, Danny, Stehle, Rudolf
We use the grid of hydrodynamic accretion disc calculations of Stehle (1999) to construct orbital phase dependent emission line profiles of thin discs carrying spiral density waves. The observational...
Schwope, Axel D., Schwarz, Robert, Staude, Andreas, Heerlein, Claus, Horne, Keith, Steeghs, Danny
We are reviewing the power of Doppler tomography for detailed investigations of polars (magnetic cataclysmic binaries without accretion disk). Using high-resolution spectroscopy in combination with...
A Doppler Map and Mass-ratio Constraint for the Black-Hole X-ray Nova Ophiuchi 1977 (1997)
Harlaftis, Emilios T., Steeghs, Danny, Horne, Keith, Filippenko, Alexei V.
We have reanalyzed Keck observations of Nova Oph 1977 to extend the work done by Filippenko et al. (1997), who recently determined a mass function f(M_x) = 4.86 +/- 0.13 M_o for the compact object....