Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..91f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L91-L94.
Astronomy and Astrophysics
Astrophysics
24
Hydrogen, Stellar Oscillations, White Dwarf Stars, Light Curve, Stellar Atmospheres, Stellar Evolution, Stellar Interiors, Stellar Rotation
Scientific paper
New period data from a recent adiabatic pulsation survey of DA white dwarfs are combined with new spectroscopic determinations of the atmospheric parameters of the ZZ Ceti star G226-29 in order to investigate the short periods observed in that star. The triplet structure of the 109.3 peak in the Fourier spectrum of the light curve suggests that the observed pulsation correspond to an l = 1 mode split but slow rotation; thus, G226-29 must have a relatively thick hydrogen layer, which is estimated here to have a mass of log q(H) = -4/4 +/- 0.2. For an l = 2 mode, log q(H) is about -6.6 +/- 0.2, while no useful constraint on the hydrogen layer mass can be obtained from period data for an l = 3 mode. An observational test for determining the l value of the 109.3 mode is suggested.
Bergeron Pierre
Brassard Pierre
Fontaine Gérard
Wesemael François
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