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The cooling of the white dwarf in U Geminorum following heating by two different outburstsWe present the analysis of 13 orbital phase-resolved IUE (large and small aperture) SWP spectra, sampling the quiescent intervals of the proptotype dwarf nova U Geminorum following two individual outbursts, the outburst of 1992, 29 August-14 September, and the outburst of 1993, 19 March-5 April. The quiescent interval following the outburst 29 August 1992 is the longest ever recorded. During quiescence, the photospheric radiation of the exposed white dwarf dominates the far ultrviolet. The variations in absorption line strengths and continum flux levels are analyzed as a function of both orbital phase and elapsed time, since the return to optical quiescence, by fitting the IUE spectra with a grid of high gravity, LTE, model atmospheres with solar composition constructed with TLUSTY and SYNSPEC (Hubeny, I. Tlusty and Synnspec: A Users Guide (1994)). We present evidence from both absorption line variations and continuum variations, as a function of time since the outbursts, that the white dwarf photosphere has cooled by several thousand degrees. Within the signal-to-noise limitations, we find no evidence of a difference in heating and cooling between the two outbursts.
Document ID
19950063726
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Huang, Min
(Villanova University Villanova, PA, United States)
Sion, Edward M.
(Villanova University Villanova, PA, United States)
Szkody, Paula
(University of Washington, Seattle, WA United States)
Date Acquired
August 17, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Astronomical Journal
Volume: 109
Issue: 4
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
95A95325
Funding Number(s)
CONTRACT_GRANT: NAGW-5184
CONTRACT_GRANT: NAGW-3158
Distribution Limits
Public
Copyright
Other

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