The triple alpha reaction at low temperatures in accreting white dwarfs and neutron stars

Astronomy and Astrophysics – Astronomy

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Low Temperature Environments, Neutron Stars, Nuclear Reactions, Stellar Mass Accretion, White Dwarf Stars, Gamma Ray Bursts, Helium, Reaction Kinetics, Supernovae, X Ray Astronomy

Scientific paper

The triple-alpha reaction is reviewed for low temperature (and high density) conditions which are important in accreting white dwarfs and neutron stars. The alpha + alpha and Be-8 + alpha reactions are found to be dominated by nonresonant terms for T of less than 28 million K and 74 million K, respectively; those have not been included in previous calculations. A general formula is given for the triple-alpha reaction rate which holds for the resonant and nonresonant regime; this deviates from the resonant rate up to 20 orders of magnitude at T of less than about 30 million K. Consequences for helium burning in accreting white dwarfs and neutron stars are presented which involve models for Type I supernovae, and gamma-ray and X-ray bursts.

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