Missing link of pulsar evolution

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Pulsars, Stellar Evolution, X Ray Binaries, Angular Momentum, Cataclysmic Variables, Companion Stars

Scientific paper

An account is given of current efforts to theoretically characterize and explain the eclipsing millisecond pulsar PSR1957+20, giving attention to new speculation that the pulsar represents an evolutionary link, hitherto only hypothesized, between low-mass X-ray binaries and isolated pulsars observed to have millisecond periods. In this model, gas from a nearby binary companion star accumulates in an accretion disk around a neutron star. As this material subsequently settles onto the neutron star, it imparts a high specific angular momentum that spins up the neutron star to the short spin-periods required for millisec pulsation.

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