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A planetary nebula around nova V458 Vul undergoing flash ionization
R. Wesson, M. J. Barlow, R. L. M. Corradi +25
Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. H images obtained six weeks before the outburst as part of the IPHAS galactic pl…
Time-resolved optical photometry of the ultra-compact binary 4U0614+091
T. Shahbaz, C. A. Watson, C. Zurita +2
We present a detailed optical study of the ultra-compact X-ray binary 4U0614+091. We have used 63 hrs of time-resolved optical photometry taken with three different telescopes (IAC…
On the evolutionary status of short period cataclysmic variables
S. P. Littlefair, V. S. Dhillon, T. R. Marsh +5
(Abridged) We present high-speed, three-colour photometry of seven short period (Porb <= 95 mins) eclipsing CVs from the Sloan Digital Sky Survey. We determine the system parameter…
The first polarimetric signatures of infrared jets in X-ray binaries
T. Shahbaz, R. P. Fender, C. A. Watson +1
We present near-infrared linear spectropolarimetry of a sample of persistent X-ray binaries, Sco X-1, Cyg X-2 and GRS1915+105. The slopes of the spectra are shallower than what is…
Imaging the cool stars in the interacting binaries AE Aqr, BV Cen and V426 Oph
C. A. Watson, D. Steeghs, V. S. Dhillon +1
It is well known that magnetic activity in late-type stars increases with increasing rotation rate. Using inversion techniques akin to medical imaging, the rotationally broadened p…
On the ultra-compact nature of 4U1822-000
T. Shahbaz, C. A. Watson, H. Hernandez-Peralta
We report the discovery of a periodic modulation in the optical lightcurve of the candidate ultra-compact X-ray binary 4U1822-000. Using time-resolved optical photometry taken with…
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…
The component masses of the cataclysmic variable V347 Puppis
T. D. Thoroughgood, V. S. Dhillon, D. Steeghs +7
We present time-resolved spectroscopy and photometry of the double-lined eclipsing cataclysmic variable V347 Pup (= LB 1800). There is evidence of irradiation on the inner hemisphe…
The massive neutron star or low-mass black hole in 2S0921-630
T. Shahbaz, J. Casares, C. Watson +4
We report on optical spectroscopy of the eclipsing Halo LMXB 2S0921-630, that reveals the absorption line radial velocity curve of the K0III secondary star with a semi-amplitude K_…
The masses of the cataclysmic variables AC Cancri and V363 Aurigae
T. D. Thoroughgood, V. S. Dhillon, C. A. Watson +3
We present time-resolved spectroscopy and photometry of the double-lined eclipsing cataclysmic variables AC Cnc and V363 Aur (= Lanning 10). There is evidence of irradiation on the…
Roche tomography of the secondary stars in CVs
C. A. Watson, V. S. Dhillon
The secondary stars in cataclysmic variables (CVs) are key to our understanding of the origin, evolution and behaviour of this class of interacting binary. In seeking a fuller unde…
Stokes imaging, Doppler mapping and Roche tomography of the AM Her system V834 Cen
Stephen B. Potter, E. Romero-Colmenero, C. A. Watson +2
We report on new simultaneous phase resolved spectroscopic and polarimetric observations of the polar (AM Herculis star) V834 Cen during a high state of accretion. Strong emission…
ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir
W. J. Feline, V. S. Dhillon, T. R. Marsh +3
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 spo…
Roche tomography of cataclysmic variables -- II. Images of the secondary stars in AM Her, QQ Vul, IP Peg and HU Aqr
C. A. Watson, V. S. Dhillon, R. G. M. Rutten +1
We present a set of Roche tomography reconstructions of the secondary stars in the cataclysmic variables AM Her, QQ Vul, IP Peg and HU Aqr. The image reconstructions show distinct…