Is the millisecond pulsar formed from coalescence of a close neutron-star binary

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Binary Stars, Neutron Stars, Pulsars, Stellar Evolution, Angular Velocity, Roche Limit, Stellar Mass Accretion, Stellar Models

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The combination of short pulse period and abnormally weak surface dipole magnetic-field strength, in contrast to the canonical pulsar value of the 1.5-ms pulsar PSR 1937+214 has led to the suggestion that it is an old neutron star that was spun up by accretion in a binary system. The authors point out difficulties with such a model: massive binaries are unlikely to live sufficiently long to allow the required amount of spin-up matter to be accreted; in low-mass binaries the companion star is still expected to be present. The authors argue that a likely alternative is: formation by coalescence of two neutron stars that formed a close binary such as PSR 1913+16. These (inevitable) events may occur in the galaxy at a rate ≡10-4 yr-1, and provide a natural explanation of the millisecond rotation period.

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