ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir

Details ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir

2003-10-17

arxiv.org/abs/astro-ph/0310504v2

Mon.Not.Roy.Astron.Soc. 347 (2004) 1173

Astronomy and Astrophysics

Astrophysics

8 pages LaTeX, 6 figures. Accepted by MNRAS; erratum added at end. Mon.Not.Roy.Astron.Soc. 347 (2004) 1173, erratum in press

Scientific paper

10.1111/j.1365-2966.2004.07281.x

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 spot have been observed. We use timings of these eclipses to derive a purely photometric model of the system, obtaining a mass ratio of q = 0.175 +/- 0.025, an inclination of i = 79.2 +/- 0.7 degrees and a disc radius of Rd/a = 0.2315 +/- 0.0150. We separate the white dwarf eclipse from the lightcurve and, by fitting a blackbody spectrum to its flux in each passband, obtain a white dwarf temperature of T = 21700 +/- 1200 K and a distance of D = 650 +/- 210 pc. Assuming that the primary obeys the Nauenberg (1972) mass-radius relation for white dwarfs and allowing for temperature effects, we also find a primary mass Mw/Msun = 0.90 +/- 0.19, primary radius Rw/Rsun = 0.0097 +/- 0.0031 and orbital separation a/Rsun = 0.75 +/- 0.05.

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