Atmospheric parameters of the variable DB white dwarf GD 358

Details Atmospheric parameters of the variable DB white dwarf GD 358 Atmospheric parameters of the variable DB white dwarf GD 358

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..423k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 423-428.

Astronomy and Astrophysics

Astrophysics

39

Iue, Stellar Atmospheres, Stellar Spectra, Stellar Temperature, Variable Stars, White Dwarf Stars, Abundance, Least Squares Method, Line Spectra, Signal To Noise Ratios

Scientific paper

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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