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Phase-resolved spectroscopy of the helium dwarf nova 'SN 2003aw' in quiescence
G. Roelofs, P. Groot, T. Marsh +2
High time resolution spectroscopic observations of the ultra-compact helium dwarf nova 'SN 2003aw' in its quiescent state at V=20.5 reveal its orbital period at 2027.8 +/- 0.5 seco…
A ZZ Ceti white dwarf in SDSS J133941.11+484727.5
B. T. Gaensicke, P. Rodriguez-Gil, T. R. Marsh +19
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 D…
ULTRACAM photometry of the eclipsing cataclysmic variables GY Cnc, IR Com and HT Cas
W. J. Feline, V. S. Dhillon, T. R. Marsh +2
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 ecl…
Detection of a period decrease in NN Ser with ULTRACAM: evidence for strong magnetic braking or an unseen companion?
C. S. Brinkworth, T. R. Marsh, V. S. Dhillon +1
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 UL…
Ultraviolet studies of interacting binaries
B. T. Gaensicke, D. de Martino, T. R. Marsh +4
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 ou…
Subdwarf B binaries in the Edinburgh-Cape Survey
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +2
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 sp…
Period Changes in Ultra-compact Double White Dwarfs
T. R. Marsh, G. Nelemans
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,…
High-speed, multi-colour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM
V. S. Dhillon, T. R. Marsh, F. Hulleman +5
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+6…
ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence
T. Shahbaz, V. S. Dhillon, T. R. Marsh +5
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'…
Tracing the spiral arms in IP Pegasi
R. Baptista, L. Morales-Rueda, E. T. Harlaftis +2
We report the analysis of time-resolved spectroscopy of IP Pegasi in outburst with eclipse mapping techniques to investigate the location and geometry of the observed spiral struct…
Multiband Echo Tomography of Sco X-1
T. Muñoz-Darias, I. G. Martínez-Pais, J. Casares +5
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 e…
SDSS J124058.03-015919.2: A new AM CVn star with a 37-minute orbital period
G. H. A. Roelofs, P. J. Groot, T. R. Marsh +3
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 orbita…
Cataclysmic variables from a ROSAT/2MASS selection I: Four new intermediate polars
B. T. Gaensicke, T. R. Marsh, A. Edge +8
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 backgrou…
Echo Tomography of Sco X-1 using Bowen Fluorescence Lines
J. Casares, T. Muñoz-Darias, I. G. Martinez-Pais +5
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 e…
Six detached white-dwarf close binaries
L. Morales-Rueda, T. R. Marsh, P. F. L. Maxted +4
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, WD1…