Oxygen neutronization in accreting white dwarfs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gravitational Collapse, Nuclear Reactions, White Dwarf Stars, Carbon, Electron Capture, Oxygen, Stellar Mass Accretion

Scientific paper

Solid carbon-oxygen white dwarf cores have been shown to be likely initial configurations for collapse to neutron star densities. Solidification seems to entail carbon/oxygen separation, with oxygen settling at the star's center and carbon being confined to more external, lower-density layers. Electron captures on 16O are then the triggering mechanism for collapse. Here the authors elucidate the outcome of the complete reaction network started by those captures and derive simple expressions for accurately describing the approach to nuclear statistical equilibrium along this hitherto neglected evolutionary path.

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