Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-08
Astronomy and Astrophysics
Astrophysics
10 pages LaTeX, 5 figures. Accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08302.x
We present high-speed, three-colour photometry of the faint eclipsing cataclysmic variables XZ Eri and DV UMa. We determine the system parameters through two techniques: first, timings of the eclipse contact phases of the white dwarf and bright-spot using the derivative of the light curve; and secondly, a parameterized model of the eclipse fitted to the observed light curve by chi-squared minimisation. For both objects, we prefer the latter method, as it is less affected by photon noise and rapid flickering. For XZ Eri we obtain a mass ratio q = 0.1098 +/- 0.0017 and an orbital inclination i = 80.16 +/- 0.09 degrees. For DV UMa we derive figures of q = 0.1506 +/- 0.0009 and i = 84.24 +/- 0.07 degrees. The secondary star in XZ Eri has a very low mass Mr/Msun = 0.0842 +/- 0.0024, placing it close to the upper limit on the mass of a brown dwarf.
Brinkworth Carolyn S.
Dhillon Vik S.
Feline William James
Marsh Thomas R.
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