Evolutionary history of the 6.1-ms pulsar

Physics

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Binary Stars, Pulsars, Stellar Evolution, Circular Orbits, Mass Transfer, Neutron Stars, Red Giant Stars, Stellar Rotation, White Dwarf Stars

Scientific paper

The recently discovered binary pulsar PSR1953+29 is cited as typical example of the simplest evolution scenario for a pulsar. The 6.1 msec period, orbital period of 120 days, and circular orbit indicate an initial epoch of mass transfer after the formation of a neutron star. The mass flowed from the low-mass secondary to the neutron primary, which attained a circular orbit and experienced a spin-up. At the last moment of mass transfer, the secondary was filling its Roche lobe and began burning the remainder of its hydrogen shell, shrinking and loosing mass until it became a white dwarf. The secondary would have had a mass of about 0.32 solar mass at the end of mass transfer, which lasted more than 10 million years. It is suggested that if the secondary is still shrinking, its emissions should move horizontally across the H-R diagram at a constant luminosity of 300 solar luminosities and be visible to optical searches from the earth.

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