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Asteroseismology of the DBV White Dwarf GD 358 with the Whole Earth Telescope

Published online by Cambridge University Press:  12 April 2016

D.E. Winget ,
R.E. Nather ,
J.C. Clemens ,
J. Provencal ,
S.J. Kleinman ,
P.A. Bradley ,
C.F. Claver ,
J.S. Dixson ,
M.A. Wood  and
A.D. Grauer
...Show all authors
D.E. Winget
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas Alfred P. Sloan Research Fellow
R.E. Nather
Affiliation:
Indian Space Research Organization, Bangalore, India
J.C. Clemens
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
J. Provencal
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
S.J. Kleinman
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
P.A. Bradley
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
C.F. Claver
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
J.S. Dixson
Affiliation:
Department of Astronomy McDonald Observatory, University of Texas
M.A. Wood
Affiliation:
Department of Physics and Space Sciences, Florida Institute of Technology
A.D. Grauer
Affiliation:
Department of Physics and Astronomy, University of Arkansas Visiting Astronomer, Kitt Peak National Observatory
B.P. Hine
Affiliation:
NASA Ames Research Center
C.J. Hansen
Affiliation:
J.I.L.A., University of Colorado
P. Bergeron
Affiliation:
Departement de Physique, Université de Montréal, Canada
P. Birch
Affiliation:
Perth Observatory, Bickley, Western Australia
M. Candy
Affiliation:
Perth Observatory, Bickley, Western Australia
E. Leibowitz
Affiliation:
Department of Physics and Astronomy, Ramat Aviv, Israel
T.M.K. Marar
Affiliation:
Indian Space Research Organization, Bangalore, India
S. Seetha
Affiliation:
Indian Space Research Organization, Bangalore, India
B.N. Ashoka
Affiliation:
Indian Space Research Organization, Bangalore, India
D. O’Donoghue
Affiliation:
Department of Astronomy, University of Cape Town, South Africa
B. Warner
Affiliation:
Department of Astronomy, University of Cape Town, South Africa
D.A. Buckleys
Affiliation:
Department of Astronomy, University of Cape Town, South Africa
P. Tripe
Affiliation:
Department of Astronomy, University of Cape Town, South Africa
G. Vauclair
Affiliation:
Observatoire Midi-Pyrenees, France
N. Doleza
Affiliation:
Observatoire Midi-Pyrenees, France
M. Chevreton
Affiliation:
Observatoire de Meudon, France
A. Kanaan
Affiliation:
Instituto de Fisica, Universidade Federai do Rio Grande do Sul, Brazil
S.O. Kepler
Affiliation:
Instituto de Fisica, Universidade Federai do Rio Grande do Sul, Brazil Visiting Astronomer, Cerro Tololo Interamerican Observatory
T. Augusteijn
Affiliation:
European Southern Observatory Chile

Abstract

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We report the analysis of 154 hours of nearly continuous high-speed photometric data on the pulsating DB white dwarf (DBV) GD 358 obtained during the Whole Earth Telescope (WET) run of May 1990. The Fourier transform (FT) of the light curve is dominated by power in the range from 1200 – 1700μHz with more than 180 significant peaks in the total transform. We also see significant power at the sums and differences of the dominant frequencies, indicating the importance of nonlinear behavior. We can use this data to obtain an accurate total stellar mass, and surface He layer mass. The implied surface He layer mass, if correct, provides a significant and surprising challenge to stellar evolution theory, as well as the theory of chemical mixing.

Type
XI. Supplement
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 789 - 791
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Nather, R.E., Winget, D.E., Clemens, J.C., Hansen, C.J., and Hine, B.P. 1990, Ap. J. 361, 309.CrossRefGoogle Scholar
Winget, D.E., et al. 1991, Ap.J. 378, 326.Google Scholar