Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-03
Astrophys.J. 614 (2004) L61-L64
Astronomy and Astrophysics
Astrophysics
to appear in the ApJ October 15 2004 issue
Scientific paper
10.1086/425497
We present an analysis of HST STIS data of VW Hyi acquired ~ 14 days after a superoutburst. At the time of the observation the system appears to be going into outburst with the longest wavelengths increasing in flux by a factor of 5, while the shortest wavelengths increase by only a factor of 2. Using the distance of 65 pc, a system inclination angle of 60 degrees and a white dwarf mass of 0.86 solar mass, we carried out model fits involving a white dwarf by itself, an optically thisck accretion disk by itself, a composite model using an optically thick accretion disk and a white dwarf, a two-temperature white dwarf model with a cooler more slowly rotating photosphere and a hotter, rapidly rotating accretion belt and a composite model involving a white dwarf and a rapidly rotating cooler disk ring heated up to a ``low'' temperature of \~13-14,000K. This component of temperature stays fairly constant throughout the HST observations while the area of the disk ring increases by a factor of 12. We see evidence of a delay in the UV emission consistent with the outburst beginning outside of a disk truncation radius.
Cheng Fu-Hua
Gaensicke Boris T.
Sion Edward M.
Szkody Paula
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