Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..691m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 15, 1987, p. 691-707.
Astronomy and Astrophysics
Astrophysics
26
Neutrinos, Neutron Stars, Nuclear Interactions, Stellar Interiors, Stellar Radiation, Baryons, Bremsstrahlung, Electrons, Emissivity, Hyperons, Strong Interactions (Field Theory), Weak Interactions (Field Theory)
Scientific paper
Several neutrino emission processes expected to occur in neutron stars containing hyperons are examined. The processes are assumed to occur in a dense, degenerate environment subject to charge and beta-equilibrium in which the electrons are extremely relativistic and the baryons nonrelativistic. Numerical results are obtained for a number of neutron star scenarios characterized by fixed values of the fractional baryon populations and the electron-to-baryon ratio. In all scenarios considered, it is found that the Urca processes dominate the bremsstrahlung processes and that among the Urca processes, the most important processes are those involving nucleons alone, provided the nucleons in the interior are normal. If either the neutrons or protons are superfluid, however, then processes involving hyperons will contribute the largest emissivities, significantly accelerating the cooling.
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