期刊
ASTRONOMY & ASTROPHYSICS
卷 451, 期 3, 页码 1049-1052出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20054473
关键词
magnetohydrodynamics (MHD); pulsars : general; stars : neutron; X-ray : stars; stars : magnetic fields
We discuss the mean-field dynamo action in protoneutron stars that are subject to instabilities during the early evolutionary phase. The mean field is generated in the neutron-finger unstable region where the Rossby number is similar to 1 and mean-field dynamo is efficient. Depending on the rotation rate, the mean-field dynamo can lead to the formation of three different types of pulsars. If the initial period of the protoneutron star is short, then the generated large-scale field is very strong (> 3 x 10(13) G) and exceeds the small-scale field at the neutron star surface. If rotation is moderate, then the pulsars are formed with more or less standard dipole fields (< 3 x 10(13) G) but with surface small-scale magnetic fields stronger than the dipole field. If rotation is very slow, then the mean-field dynamo does not operate, and the neutron star has no global field. Nevertheless, strong small-scale fields are generated in such pulsars, and they can manifest themselves as objects with very low spin-down rate but with a strong magnetic field inferred from the spectral features.
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