Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jrasc..74..147l&link_type=abstract
Journal of the Royal Astronomical Society of Canada, vol. 74, June 1980, p. 147-162. In French. Research supported by the Natur
Astronomy and Astrophysics
Astrophysics
1
Stellar Evolution, Stellar Radiation, Variable Stars, White Dwarf Stars, Astrophysics, Light Curve, Stellar Rotation
Scientific paper
The observed properties of ZZ Ceti-type variable stars are reviewed, and several hypotheses concerning the nature of these variable white dwarfs are presented. The white dwarfs of this type are all shown to exhibit a DA spectral type and a (B - V) index around plus 0.20, and it is noted that Fourier analyses of their light curves clearly indicate the variations to be due to nonradial stellar pulsations. The linear theory of nonradial stellar pulsations is outlined, and predictions of the theory regarding the dependence of the period on the k, 1 and m indices are indicated. Observations are interpreted in terms of the passage of a significant fraction of DA-type white dwarfs through an evolutionary phase characterized by instability, most likely caused by a hydrogen kappa-type mechanism, with the nonradial mode a result of the high gravity of white dwarf stars. Implications of the further investigation of ZZ Ceti variables for the determination of the radial variation of stellar composition and the rotation of white dwarfs are indicated.
Fontaine Gérard
Lacombe P.
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