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The Effect of Varying Helium and Hydrogen Layer Masses on the Pulsation Properties of White Dwarf Models

Published online by Cambridge University Press:  12 April 2016

P.A. Bradley ,
D.E. Winget  and
M.A. Wood

Extract

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Currently, there are disagreements on the theoretical pulsation properties of DA white dwarf models. Winget and his group (cf Winget 1981, Winget and Fontaine 1982, Winget et al. 1981, 1982) use 0.6M⊙ evolutionary white dwarf models, to find that (Teff)blue is sensitive to the mass of the hydrogen layer and very sensitive to the treatment of convective efficiency. However, (Teff)blue is relatively insensitive to the helium layer mass. Winget and collaborators also find that the hydrogen layer must be restricted to 10−8 > MH/M* > 10−12 for (Teff)blue to occur at ∼ 10,500K in models with ML1 convection (see below). More efficient (ML2) convection pushes the blue edge up to ∼ 12,200K, which is still short of the observed blue edge of ∼ 13,000K.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 286 - 289
Copyright
Copyright © Springer-Verlag 1989

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