Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477l..99c&link_type=abstract
Astrophysical Journal Letters v.477, p.L99
Astronomy and Astrophysics
Astronomy
20
Stars: Neutron, Stars: Pulsars: General, Dense Matter
Scientific paper
The relationships between the effective surface temperature Teff and the internal temperature Tb of nonmagnetized neutron stars with and without accreted envelopes are calculated for Teff > 5 x 104 K. We use updated equations of state and radiative opacities, and we improve considerably the electron conductive opacity. We examine various models of accreted layers (H, He, C, and O subshells produced by nuclear burning of accreted matter). The resulting Teff-Tb relationship is remarkably insensitive to the details of the models and depends mainly on the accreted mass Delta M. For Teff > 105 K, the accreted matter is generally more heat transparent. Even a small accreted mass ( Delta M >~ 10-13 Msolar) affects appreciably the cooling of a neutron star, leading to higher Teff at the neutrino cooling stage and to lower Teff at the subsequent photon stage. We illustrate this by simulating the standard cooling of neutron stars. The presence of accreted matter yields better agreement of our model cooling curves with the blackbody fits to the ROSAT spectral observations of cooling neutron stars, without invoking quark matter or superfluidity in the neutron star cores.
Chabrier Gilles
Potekhin Alexander Y.
Yakovlev Dmitry G.
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