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2002MNRAS.332..399B - Mon. Not. R. Astron. Soc., 332, 399-408 (2002/May-2)
Time-dependent diffusion in pulsating white dwarf stars: asteroseismology of G117-B15A.
BENVENUTO O.G., CORSICO A.H., ALTHAUS L.G. and SERENELLI A.M.
Abstract (from CDS):
The evolution of each of the considered model sequences was followed down to very low effective temperatures; in particular, from 12500K on we computed the dipolar, linear, adiabatic oscillations with radial order k=1,...,4. We find that asteroseismological results are not univocal regarding mode identification for the case of G117-B15A. However, our asteroseismological results are compatible with spectroscopic data only if the observed periods of 215.2, 271.0 and 304.4s are due to dipolar modes with k =2,3,4, respectively.
Our calculations indicate that the best fit to the observed period pattern of G117-B15A corresponds to a DA white dwarf structure with a stellar mass of 0.525M☉, with a hydrogen mass fraction log(MH/M*)≳-3.83 at an effective temperature Teff~11800K. The value of the stellar mass is consistent with that obtained spectroscopically by Koester & Allard.
Abstract Copyright: 2002 Blackwell Science Ltd
Journal keyword(s): stars: evolution - stars: individual: G117-B15A - stars: interiors - stars: oscillations - white dwarfs
Simbad objects: 2
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