Constraints on 12C(alpha,gamma)16O from White Dwarf Seismology

Details Constraints on 12C(alpha,gamma)16O from White Dwarf Seismology Constraints on 12C(alpha,gamma)16O from White Dwarf Seismology

2001-08-31

arxiv.org/abs/astro-ph/0108501v1

2002, ASP Conf. Series v.259, p.602

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in proceedings of IAU Colloquium 185

Scientific paper

For many years, astronomers have promised that the study of pulsating white dwarfs would ultimately lead to useful information about the physics of matter under extreme conditions of temperature and pressure. We can now make good on that promise. Using observational data from the Whole Earth Telescope and a new analysis method employing a genetic algorithm, we empirically determine the central oxygen abundance of the helium-atmosphere variable white dwarf GD 358. We use this value, combined with detailed evolutionary calculations of the internal chemical profiles to place constraints on the 12C(alpha,gamma)16O nuclear reaction cross-section.

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