The cooling of neutron stars by the direct URCA process

Details The cooling of neutron stars by the direct URCA process The cooling of neutron stars by the direct URCA process

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394l..17p&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. L17-L20. Research supported by NASA

Astronomy and Astrophysics

Astrophysics

120

Cooling, Neutron Stars, Nuclear Astrophysics, Stellar Interiors, Stellar Temperature, Stellar Evolution, Stellar Mass, Stellar Models, Superfluidity

Scientific paper

The first results are reported from a program to reanalyze the cooling of neutron stars by including the direct Urca process in calculations. It is found that the surface temperature of a young neutron star drops dramatically after about 100 yr if the direct Urca process is allowed and nucleons do not become superfluid. If nucleon superfluidity occurs throughout the direct Urca region, the surface temperature drops to a value determined by the superfluid transition temperature after about 100 yr and decreases slowly for the next 100,000 yr, at which time surface photon cooling takes over. By comparison with observational data, it is found that superfluid transition temperatures of the order of 10 exp 9 K are required in the whole direct Urca inner core.

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