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Title:
Atmospheric parameters of the variable DB white dwarf GD 358
Authors:
Koester, D.; Vauclair, G.; Dolez, N.; Oke, J. B.; Greenstein, J. L.; Weidemann, V.
Affiliation:
AA(Kiel, Universitaet, Institut fuer theoretische Physik und Sternwarte, West Germany), AB(Pic-du-Midi et Toulouse, Observatoires, Toulouse, France), AC(Pic-du-Midi et Toulouse, Observatoires, Toulouse, France), AD(Palomar Observatory, Pasadena, CA), AE(Palomar Observatory, Pasadena, CA)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 423-428. (A&A Homepage)
Publication Date:
08/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
IUE, STELLAR ATMOSPHERES, STELLAR SPECTRA, STELLAR TEMPERATURE, VARIABLE STARS, WHITE DWARF STARS, ABUNDANCE, LEAST SQUARES METHOD, LINE SPECTRA, SIGNAL TO NOISE RATIOS
Bibliographic Code:
1985A&A...149..423K

Abstract

This paper presents new observations of GD 358, the prototype of the class of variable white dwarfs with helium-dominated atmospheres (DB). These data, together with previous observations, are analyzed using new model atmosphere calculations. The results are Teff = 24000±1000K, log g = 8.0±0.3. This temperature is within the range predicted for instability strips. It seems to demand more effective convection than provided by the standard mixing length approximation. The implications of this result for the understanding of convection and white dwarf pulsations are discussed.

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