Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-07
Astronomy and Astrophysics
Astrophysics
18 pages + 10 figures, uses epsf.sty. Accepted by MNRAS
Scientific paper
10.1046/j.1365-8711.1998.01375.x
The evolution of neutron stars in close binary systems with a low-mass companion is considered assuming the magnetic field to be confined within the solid crust. We adopt the standard scenario of the evolution in a close binary system in accordance with which the neutron star passes throughout four evolutionary phases ("isolated pulsar" -- "propeller" -- accretion from the wind of a companion -- accretion due to Roche-lobe overflow). Calculations have been performed for a great variety of parameters characterizing the properties both of the neutron star and low-mass companion. We find that neutron stars with more or less standard magnetic field and spin period being processed in low-mass binaries can evolve to low-field rapidly rotating pulsars. Even if the main-sequence life of a companion is as long as $10^{10}$ yr, the neutron star can maintain a relatively strong magnetic field to the end of the accretion phase. The considered model can well account for the origin of millisecond pulsars.
Geppert Ulrich
Konenkov Denis
Urpin Vadim
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