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A detection of the evolutionary time scale of the DA white dwarf G117 - B15A with the Whole Earth TelescopeThe time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117 - B15A has been detected using the Whole Earth Telescope (WET). The observed rate of period change, P(dot) = (12.0 + or - 3.5) x 10 to the -15th s/s, is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. Other effects that could contribute to the observed rate of period change are discussed.
Document ID
19910067046
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kepler, S. O.
(Montreal Univ. Quebec Canada)
Fontaine, G.
(Montreal Univ. Quebec Canada)
Bergeron, P.
(Montreal, Universite Montreal, Canada)
Winget, D. E.
(Montreal Univ. Quebec Canada)
Nather, R. E.
(Montreal Univ. Quebec Canada)
Bradley, P. A.
(Montreal Univ. Quebec Canada)
Claver, C. F.
(McDonald Observatory; Texas, University Austin, United States)
Grauer, A. D.
(Arkansas, University Little Rock, United States)
Vauclair, G.
(Observatoire Midi-Pyrenees Toulouse, France)
Marar, T. M. K.
(ISRO, Satellite Centre Bangalore, India)
Date Acquired
August 14, 2013
Publication Date
September 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 378
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A51669
Distribution Limits
Public
Copyright
Other

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