Thermonuclear-flash models for X-ray burst sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Neutron Stars, Stellar Mass Accretion, Stellar Models, Surface Layers, Thermonuclear Reactions, X Ray Sources, Bursts, Gamma Ray Astronomy, Mathematical Models, Pulsars, Stellar Evolution, Stellar Luminosity, Stellar Temperature

Scientific paper

Theoretical models for X-ray burst sources that invoke thermonuclear flashes in the surface layers of an accreting neutron star are discussed. Emphasis is placed on the studies by Joss (1978) and Joss and Li (1979) on the evolution of the helium-burning shell. Numerical calculations with regard to the mass accretion rate, core temperature of the neutron star and the sensitivity of the flash properties to the assumed mass and radius of the neutron star are considered. Attention is also given to the behavior of the surface luminosity following a thermonuclear flash, the decline from maximum X-ray luminosity, structure of the surface layers prior to and during the first helium-burning flash and the temporal evolution of the first X-ray burst.

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