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An HST parallax of the distant cataclysmic variable V1223 Sgr, its system parameters, and accretion rate | | K. Beuermann
; Th.E. Harrison
; B.E. McArthur
; G.F. Benedict
; B.T. Gaensicke
; | | Date: |
24 Feb 2004 | | Journal: | Astron.Astrophys. 419 (2004) 291-299 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0402548 | | Services: | Forum | Review | PDF | Favorites | |
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