Period derivative of the millisecond pulsar in globular cluster M28

Details Period derivative of the millisecond pulsar in globular cluster M28 Period derivative of the millisecond pulsar in globular cluster M28

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326l..13f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 326, March 1, 1988, p. L13-L15.

Mathematics

Probability

25

Astrometry, Globular Clusters, Pulsars, Gravitational Effects, Stellar Mass Accretion, Very Large Array (Vla)

Scientific paper

The period derivative of the recently discovered 3-ms pulsar PSR 1821-24 (Lynn et al., 1987) located near the center of globular cluster M28 has been measured. While the observed slow-down rate, 1.6 x 10 to the -18th s/s, is somewhat larger than expected, it is still consistent with models of ms-pulsar evolution that involve spin-up during mass accretion from an orbiting companion star. It is possible that a substantial fraction of the observed period derivative could be the result of a gravitational encounter with a neighboring star in the cluster core. The probability of observing such an event is rather small, however. Timing residuals have so far placed constraints on the possibility of PSR 1821-24 being in a wide binary system.

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