An HST STIS Observation of VW Hydri at the Exact FUV Onset of an Outburst

Details An HST STIS Observation of VW Hydri at the Exact FUV Onset of an Outburst An HST STIS Observation of VW Hydri at the Exact FUV Onset of an Outburst

2004-09-03

arxiv.org/abs/astro-ph/0409079v1

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.

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