An HST parallax of the distant cataclysmic variable V1223 Sgr, its system parameters, and accretion rate

Details An HST parallax of the distant cataclysmic variable V1223 Sgr, its system parameters, and accretion rate An HST parallax of the distant cataclysmic variable V1223 Sgr, its system parameters, and accretion rate

2004-02-24

arxiv.org/abs/astro-ph/0402548v1

Astron.Astrophys. 419 (2004) 291-299

Astronomy and Astrophysics

Astrophysics

Accepted for A&A, 9 pages, 2 figures

Scientific paper

10.1051/0004-6361:20034424

Using the Hubble space Telescope Fine Guidance Sensor, we have measured the trigonometric parallax of the bright cataclysmic variable 1223 Sgr. The absolute parallax is pi(abs)= 1.96+-0.18mas, making V1223 Sgr the most distant CV with a well-determined trigonometric parallax. This distance, a Lutz-Kelker correction, and the previously measured extinction yield an absolute visual high-state magnitude Mv=4.0+-0.2. We outline a model, which is consistent with the observed spin-down of the white dwarf and provides for much of the UV/optical emission by reverberation of X-rays. From previous X-ray and UV/optical data, we derive an accretion luminosity Lacc=(2.6+-0.8)e34 erg/s, a white dwarf mass M_1=0.93+-0.12Msun, and an accretion rate dot M=(1.4+-0.3)e17 g/s.

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