UNSPECIFIED. (2004) A Hubble Space Telescope STIS observation of VW Hydri at the exact far-ultraviolet onset of an outburst. ASTROPHYSICAL JOURNAL, 614 (1 Part 2). L61-L64. ISSN 0004-637X

Full text not available from this repository.

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
Journal or Publication Title:	ASTROPHYSICAL JOURNAL
Publisher:	UNIV CHICAGO PRESS
ISSN:	0004-637X
Date:	10 October 2004
Volume:	614
Number:	1 Part 2
Number of Pages:	4
Page Range:	L61-L64
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7941

Data sourced from Thomson Reuters' Web of Knowledge

Request changes to a record

Actions (login required)

View Item