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Asteroseismology of the DOV star PG 1159 - 035 with the Whole Earth TelescopeResults are reported from 264.1 hr of nearly continuous time-series photometry on the pulsating prewhite dwarf star (DPV) PG 1159 - 035. The power spectrum of the data set is completely resolved into 125 individual frequencies; 101 of them are identified with specific quantized pulsation modes, and the rest are completely consistent with such modal assignment. It is argued that the luminosity variations are certainly the result of g-mode pulsations. Although the amplitudes of some of the peaks exhibit significant variations on the time scales of a year or so, the underlying frequency structure of the pulsations is stable over much longer intervals. The existing linear theory is invoked to determine, or strongly constrain, many of the fundamental physical parameters describing this star. Its mass is found to be 0.586 solar mass, is rotation period 1.38 days, its magnetic field less than 6000 G, its pulsation and rotation axes to be aligned, and its outer layers to be compositionally stratified.
Document ID
19910065887
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Winget, D. E.
(Texas Univ. Austin, TX, United States)
Nather, R. E.
(Texas Univ. Austin, TX, United States)
Clemens, J. C.
(Texas Univ. Austin, TX, United States)
Provencal, J.
(Texas Univ. Austin, TX, United States)
Kleinman, S. J.
(Texas Univ. Austin, TX, United States)
Bradley, P. A.
(Texas Univ. Austin, TX, United States)
Wood, M. A.
(Texas Univ. Austin, TX, United States)
Claver, C. F.
(Texas Univ. Austin, TX, United States)
Frueh, M. L.
(Texas, University; McDonald Observatory, Austin, United States)
Grauer, A. D.
(Arkansas, University Little Rock, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 378
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A50510
Funding Number(s)
CONTRACT_GRANT: NSF AST-85-52456
CONTRACT_GRANT: NSF AST-87-12249
CONTRACT_GRANT: NSF AST-86-00507
CONTRACT_GRANT: NGT-50210
CONTRACT_GRANT: NSF AST-88-13572
Distribution Limits
Public
Copyright
Other

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