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Constraints on 12C(α,γ)16O from White Dwarf Seismology

Published online by Cambridge University Press:  12 April 2016

T.S. Metcalfe ,
M. Salaris  and
D.E. Winget
T.S. Metcalfe
Affiliation:
Theoretical Astrophysics Center, Institute of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
M. Salaris
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
D.E. Winget
Affiliation:
Department of Astronomy (C1400), University of Texas, Austin TX 78712, USA

Abstract

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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(α, γ)16O nuclear reaction cross-section.

Type
Part 6. Asteroseismology from Space and from the Ground
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 602 - 605
Copyright
Copyright © Astronomical Society of the Pacific 2002

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