Old pulsars in the low-density globular clusters M13 and M53

Details Old pulsars in the low-density globular clusters M13 and M53 Old pulsars in the low-density globular clusters M13 and M53

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349...47k&link_type=abstract

Nature (ISSN 0028-0836), vol. 349, Jan. 3, 1991, p. 47-49. Research supported by DOE.

Other

24

Binary Stars, Companion Stars, Globular Clusters, Pulsars, Stellar Luminosity, Gravitational Fields, Neutron Stars, Pulse Duration, Radio Telescopes

Scientific paper

The surprising discovery of two pulsars in low-density globular clusters is reported. One is a single 10-ms pulsar (1639 + 36) in M13 and the other is a 33-ms pulsar (1310 + 18) in a 256-day binary in M53. Their ages, inferred from their luminosities and constraints on their period derivatives, seem to be about a billion yr, significantly greater than previously reported ages of cluster pulsars. The implied birth rate is inconsistent with the conventional two-body tidal capture model, suggesting that an alternative mechanism such as tidal capture between primordial binaries and a reservoir of primordial neutron stars may dominate the production of tidal binaries in such clusters. The period derivative of PSR1639 + 36 is surprisingly small, and may be corrupted by acceleration due to the mean gravitational potential of the cluster.

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