Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295l..27m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. L27-L30
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Eclipsing Binary Stars, Pulsars, Stellar Evolution, Stellar Interiors, Stellar Magnetic Fields, Stellar Structure, Mathematical Models, Periodic Variations, Pulsar Magnetospheres, Stellar Orbits
Scientific paper
We present a schematic picture of evolution of the low-mass binary system containing the 1 s eclipsing radio pulsar PSR 1718-19. We suggest that the evolution of this system prior to the very recent phase was similar to that proposed for the low-mass binaries with millisecond pulsars. We introduce a new physical ingredient in this evolutionary scheme: that the surface magnetic field of very old, low-magnetized neutron stars may strengthen at ages approximately greater than 108 yr and even reach the canonical value of approximately 1012 G. The physical reason for such a latent magnetism of low magnetized neutron stars is the posibility of formation of a neutron star with the magnetic field buried approximately 0.5 km under the surface in the highly conducting interior. In this case, the bulk of the magnetic flux needs at least approximately 108 yr to reach the stellar surface. As the surface magnetic fields of an isolated neutron star increases the phase of the active radio pulsar shortens, which substantially reduces the effective number of such objects. We suggest that the effect of latent magnetism may manifest itself in recycled pulsars.
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