An Asteroseismic Test of Diffusion Theory

Details An Asteroseismic Test of Diffusion Theory An Asteroseismic Test of Diffusion Theory

2005-09-14

arxiv.org/abs/astro-ph/0509397v1

Mem.Soc.Ast.It.77:380-383,2006

Astronomy and Astrophysics

Astrophysics

4 pages, Workshop on Stellar Pulsation & Evolution 2005 (Rome)

Scientific paper

The helium-atmosphere (DB) white dwarfs are commonly thought to be the descendants of the hotter PG 1159 stars, which initially have uniform He/C/O atmospheres. In this evolutionary scenario, diffusion builds a pure He surface layer which gradually thickens as the star cools. In the temperature range of the pulsating DB white dwarfs (T_eff ~ 25,000 K) this transformation is still taking place, allowing asteroseismic tests of the theory. Objective global fitting of our updated double-layered envelope models to recent observations of the pulsating DB star CBS 114, and to existing observations of the slightly cooler star GD 358, lead to determinations of the envelope masses and pure He surface layers that qualitatively agree with the expectations of diffusion theory. These results provide new asteroseismic evidence supporting one of the central assumptions of spectral evolution theory, linking the DB white dwarfs to PG 1159 stars.

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