Nonequilibrium shells of neutron stars and their role in sustaining X-ray emission and nucleosynthesis

Astronomy and Astrophysics – Astronomy

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Neutron Stars, Nonequilibrium Conditions, Nuclear Fusion, Stellar Envelopes, X Ray Astronomy, Chemical Composition, Gamma Ray Astronomy, Particle Diffusion, Stellar Evolution, Stellar Mass, Stellar Structure, Stellar Temperature, Supernovae, Thermodynamic Equilibrium

Scientific paper

A review is presented of theoretical concepts of properties of matter and of processes in neutron star shells and of their relation to observations. The formation of a hot neutron star and its subsequent cooling leads to the appearance of a nonequilibrium layer in which energy of up to 10 to the 48th ergs is stored. The lack of equilibrium consists of the presence of superheavy nuclei with a large neutron excess near the limit of neutron evaporation Q(n) = 0 and of free neutrons. The slow diffusion of neutrons into the interior of the star maintains the X-ray luminosity L(X) of about 10 to the 34th ergs/sec during t = 10,000 years.

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