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Observation of a Variable, ZZ Ceti White Dwarf: GD154

Published online by Cambridge University Press:  12 April 2016

B. Pfeiffer ,
G. Vauclair ,
N. Dolez ,
M. Chevreton ,
J. R. Fremy ,
G. Herpe ,
M. Barstow ,
S. J. Kleinman ,
T. K. Watson  and
J. A. Belmonte
...Show all authors
B. Pfeiffer
Affiliation:
Observatoire Midi-Pyrénées, Toulouse, France
G. Vauclair
Affiliation:
Observatoire Midi-Pyrénées, Toulouse, France
N. Dolez
Affiliation:
Observatoire Midi-Pyrénées, Toulouse, France
M. Chevreton
Affiliation:
Observatoire de Paris-Meudon, France
J. R. Fremy
Affiliation:
Observatoire de Paris-Meudon, France
G. Herpe
Affiliation:
Observatoire de Paris-Meudon, France
M. Barstow
Affiliation:
Physics Department, University of Leicester, U. K.
S. J. Kleinman
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
T. K. Watson
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
J. A. Belmonte
Affiliation:
Instituto de Astrofisica de Canarias, Tenerife, Spain
S. O Kepler
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Bresil
A. Kanaan
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Bresil
O. Giovannini
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Bresil
R. E. Nather
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
D. E. Winget
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
J. Provencal
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
J. C. Clemens
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
P. Bradley
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
J. Dixson
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
A. D. Grauer
Affiliation:
Department of Physics and Astronomy, University of Arkansas, Little Rock, Arkansas, U. S. A.
G. Fontaine
Affiliation:
Département de Physique, Université de Montréal, Québec, Canada
P. Bergeron
Affiliation:
Département de Physique, Université de Montréal, Québec, Canada
F. Wesemael
Affiliation:
Département de Physique, Université de Montréal, Québec, Canada
C. F. Claver
Affiliation:
Astronomy Department, University of Texas at Austin, U.S.A.
T. Matzeh
Affiliation:
Department of Physics and Astronomy, University of Tel-Aviv, Israel
E. Leibowitz
Affiliation:
Department of Physics and Astronomy, University of Tel-Aviv, Israel
P. Moskalik
Affiliation:
Copernicus Astronomical Center, Warsaw, Poland

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The ZZ Ceti stars form a class of variable white dwarfs: the hydrogen dominated atmosphere ones, which do pulsate in an instability strip in the effective temperature range 13000K-11500K. We know 22 such ZZ Ceti white dwarfs. Their variations are caused by nonradial g-mode pulsations with periods are in the range 100-1000 seconds.

A subsample of the ZZ Ceti stars shows amplitude variations on time scales of the order of one month. These variations could be driven by nonlinear phenomena.

Type
II. Observational Facts
Information
International Astronomical Union Colloquium , Volume 134: Nonlinear Phenomena in Stellar Variability , 1993 , pp. 201 - 204
Copyright
Copyright © Kluwer 1993

References

Nather, R.E., Winget, D.E. Clemens, J.C., Hansen, C.J., and Hine, B.P.: 1990, Astrophysical Journal 361, 309 Google Scholar
Robinson, E.L., Stover, R.J., Nather, R.E., and McGraw, J.T.: 1978, Astrophysical Journal 220, 614.CrossRefGoogle Scholar