SIMBAD references

2008ApJ...677L..35A - Astrophys. J., 677, L35-L38 (2008/April-2)

Evidence of thin helium envelopes in PG 1159 stars.

ALTHAUS L.G., CORSICO A.H., MILLER BERTOLAMI M.M., GARCIA-BERRO E. and KEPLER S.O.

Abstract (from CDS):

We present evidence that PG 1159 stars could harbor He-rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss, which may be attributable to an extensive mass-loss episode during the born-again AGB phase. Specifically, we show that the models with thin He-rich envelopes predict remarkably large magnitudes of the rates of period change of the trapped and untrapped modes observed in the pulsating star PG 1159-035. This is a consequence of the much shorter evolutionary timescale of the models with thin He-rich envelopes during the low-gravity PG 1159 regime. Our findings are particularly interesting in view of the suggestion of an evolutionary link between the helium-deficient PG 1159 star H1504+65 and the recently discovered white dwarfs with almost pure carbon atmospheres.

Abstract Copyright:

Journal keyword(s): Dense Matter - Diffusion - Stars: Abundances - Stars: Evolution - Stars: Interiors - Stars: White Dwarfs

Simbad objects: 5

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2020.09.21-12:47:44

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