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Astron. Astrophys. 356, 171-174 (2000)

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Cooling neutron stars with localized protons

D.A. Baiko 1 and P. Haensel 2

1 A.F. Ioffe Physical Technical Institute, Politekhnicheskaya 26, 194021, St. Petersburg, Russia (baiko@astro.ioffe.rssi.ru)
2 N. Copernicus Astronomical Center, Bartycka 18, 00-716, Warsaw, Poland (haensel@camk.edu.pl)

Received 22 July 1999 / Accepted 17 January 2000


We analyze cooling of neutron stars, assuming the presence of localized protons in the densest region of their cores. Choosing a single threshold density for proton localization and adjusting neutron star mass, we reproduce the observational data on effective surface temperatures of Vela and PSR 0656+14, with or without an accreted hydrogen envelope. However, the presence of a tiny hydrogen envelope is mandatory, in this model, for reproducing the Geminga data.

Key words: stars: neutron – dense matter

Send offprint requests to: P. Haensel

© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000