Evidence for an asymptotic lower limit to the surface dipole magnetic field strengths of neutron stars

Computer Science

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Field Strength, Magnetic Dipoles, Neutron Stars, Pulsars, Radio Stars, Stellar Magnetic Fields, Asymptotic Properties, Minima, Stellar Models, X Ray Binaries

Scientific paper

The discovery of a second millisecond binary radio pulsar, PSR 1855+09 (period P = 5 ms), with a relatively wide circular orbit and low mass function indicates that the incidence of such systems among the galactic radio pulsar population is ≡4×10-3. The generally accepted model for the origin of these systems is that they have descended from low-mass X-ray binaries in which a weakly magnetized neutron star was spun-up by the accretion of matter from an evolved low-mass (≤1.2 M_sun;) companion star. The authors show that, based on the incidence of the progenitor low-mass X-ray binaries, the observed incidence of millisecond binary radio pulsars can be explained only if, at their present low field strength of ≡109G, the decay timescale of neutron-star surface magnetic dipole moments is ≥109yr.

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