Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..129z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 129-135.
Astronomy and Astrophysics
Astrophysics
20
Accretion Disks, Neutron Stars, Stellar Mass Accretion, Stellar Structure, Nuclear Astrophysics, Stellar Physics, Thermophysical Properties, X Ray Astronomy
Scientific paper
Steady state models of neutron stars accreting matter with the heavy-element content in the range of 0.000002 to 0.02 at the rate ranging from 10 exp -16 to 10 exp -11 solar mass/yr are presented. The models have steady state envelopes, with stationary hydrogen and helium-burning shell sources. The capture of electrons on protons is taken into account; this process is important in models with the lowest heavy-element content. Two typs of neutron star models are calculated: ordinary and with pion-condensed cores. The latter models have strongly enhanced neutrino cooling, and hence their isothermal cores have a lower temperature. The hydrogen and helium shells burn in the pycnonuclear regime and are stable for accretion rates lower than about 10 exp -12.5 solar mass/yr for ordinary neutron stars, and lower than about 10 exp -11 solar mass/yr for stars with pion-condensed cores.
Haensel Pawel
Miralda-Escude' Jordi
Paczyński Bohdan
Zdunik Leszek J.
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