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Astron. Astrophys. 335, 969-972 (1998)


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The effect of interior magnetic field on the modified Urca process and the cooling of neutron stars *

Y.F. Yuan 1, 2 and J.L. Zhang 2

1 CCAST (World Laboratory) P.O. Box 8730, Beijing 100080, P.R. China
2 Center for Astrophysics, University of Science and Technology of China, Hefei 230026, Anhui, P.R. China (yuan@cfa.ustc.edu.cn; jlz@cfa.ustc.edu.cn)

Received 10 March 1998 / Accepted 25 March 1998

Abstract

The effect of a strong magnetic field on the modified Urca process in neutron star cores is considered in this paper. It is found that this effect is significant when the interior magnetic field is greater than [FORMULA] G, especially at some resonant states. In these situations, the strong magnetic field will significantly increase the rate of neutrino emission and influence the cooling of neutron stars. Comparing with the observational data, we provide information about the order of the strength of interior magnetic field for the first time. The strength we obtained is about [FORMULA] G.

Key words: dense matter – stars: magnetic fields – stars: neutron

* This work is supported by the National Natural Science Foundation and National Climbing Programme on Fundamental Researches

Send offprint requests to: Y.F. Yuan, Center for Astrophysics, University of Science and Technology of China, Hefei 230026, China

© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998

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