Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440l..77m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 440, no. 2, p. L77-L80
Astronomy and Astrophysics
Astrophysics
29
Pulsars, Stellar Evolution, Stellar Magnetic Fields, Stellar Models, Stellar Luminosity, Thermal Analysis, X Ray Sources
Scientific paper
We consider the ohmic diffusion of the internal magnetic flux through the outermost nonmagnetic layers of the crust of a newly born neutron star. We assume that at the moment of star formation or soon after, the magnetic field of strength approximately 1012 G is submerged in a closed configuration at approximately 100-150 m (approximately 200-300 m) under the stellar surface. Due to outward ohmic diffusion of an internal field the initial surface magnetic field, of strength approximately 3 x 108 G, is enhanced by a factor of approximately 3 x 103 in a few hundred (thousand) years. As a consequence of the enhancement of the surface magnetic field, the spin-down luminosity of an approximately 2 ms pulsar increases from its initial value of 2 x 1035 erg/s by a factor of a few times 105 - 106 at ages approximately 100-1000 yr and then decreases. The calculations were performed for a model of thermal evolution of a 1.4 solar mass neutron star cooling via the standard modified Urca process. The implication of this effect for young neutron stars as potential gamma-ray sources is briefly discussed.
Muslimov Alexander
Page Dany
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