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A Hubble Space Telescope STIS observation of VW Hydri at the exact far-ultraviolet onset of an outburst
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Sion, Edward M., Cheng, F. H., Gaensicke, B. T. (Boris T.) and Szkody, Paula (2004) A Hubble Space Telescope STIS observation of VW Hydri at the exact far-ultraviolet onset of an outburst. Astrophysical Journal, Volume 614 (Number 1 Part 2). L61-L64. doi:10.1086/425497 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1086/425497
Abstract
We present an analysis of Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph data of VW Hyi that we acquired 14 days after a superoutburst. At the time of our 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 60degrees, and a white dwarf mass of 0.86 M-circle dot, we carried out model fits involving a white dwarf by itself; an optically thick 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 13-14,000 K. 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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astrophysical Journal | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | 10 October 2004 | ||||
| Dates: |
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| Volume: | Volume 614 | ||||
| Number: | Number 1 Part 2 | ||||
| Number of Pages: | 4 | ||||
| Page Range: | L61-L64 | ||||
| DOI: | 10.1086/425497 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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