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The space density of cataclysmic variables: constraints from the ROSAT North Ecliptic Pole Survey
M. L. Pretorius, C. Knigge, D. O'Donoghue +3
We use the ROSAT North Ecliptic Pole (NEP) survey to construct a small, but purely X-ray flux-limited sample of cataclysmic variable stars (CVs). The sample includes only 4 systems…
The mass and radius of the M-dwarf in the short period eclipsing binary RR Caeli
P. F. L. Maxted, D. O'Donoghue, L. Morales-Rueda +1
We present new photometry and spectroscopy of the eclipsing white dwarf - M-dwarf binary star RR Cae. We use timings of the primary eclipse from white-light photo-electric photomet…
SDSS J160043.6+074802.9: a very rapid sdO pulsator
P. A. Woudt, D. Kilkenny, E. Zietsman +12
We report the serendipitous discovery of the Sloan Digital Sky Survey star, SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated by a frequency near 8380…
Simultaneous X-ray/optical observations of GX 9+9 (4U 1728-16)
A. K. H. Kong, P. A. Charles, L. Homer +2
We report on the results of the first simultaneous X-ray (RXTE) and optical (SAAO) observations of the luminous low mass X-ray binary (LMXB) GX 9+9 in 1999 August. The high-speed o…
XMM Spectroscopy of the Transient Supersoft Source RX J0513.9-6951: probing the dynamic white dwarf photosphere
Katherine E. McGowan, Phil A. Charles, Alexander J. Blustin +3
The highly luminous (> 10^37 erg s^-1) supersoft X-ray sources (SSS) are believed to be Eddington limited accreting white dwarfs undergoing surface hydrogen burning. The current pa…
Superhumps in Cataclysmic Binaries. XXIV. Twenty More Dwarf Novae
J. Patterson, J. Thorstensen, J. Kemp +23
We report precise measures of the orbital and superhump period in twenty more dwarf novae. For ten stars, we report new and confirmed spectroscopic periods - signifying the orbital…