The binary pulsar PSR 1908+00 in NGC 6760

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Eclipsing Binary Stars, Neutron Stars, Orbital Elements, Pulsars, Degenerate Matter, Stellar Mass

Scientific paper

We present orbital parameters of the 3.6 ms binary pulsar 1908+00 in the globular cluster NGC 6760. The orbital period is 3.4 hr, and the mass function is 3 x 10 exp -6 solar mass, implying a minimum companion mass of 0.018 solar mass. The companion is probably degenerate; and if it is hydrogen, it is close to overflowing its Roche lobe. The only other millisecond binary radio pulsar systems with orbital period less than 10 hr and mass function below 0.001 solar mass are the eclipsing pulsars 1957+20 and 1744-24A, and the very low mass binary 0021-72J. These pulsars are ablating their companions and may be the progenitors of isolated millisecond pulsars. PSR 1908+00 shows no evidence for long-duration eclipses as are seen in 1744-24A, but short-duration eclipses as in 1957 + 20 are not excluded.

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