Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..531w&link_type=abstract
Nature (ISSN 0028-0836), vol. 337, Feb. 9, 1989, p. 531-533.
Astronomy and Astrophysics
Astronomy
63
Globular Clusters, Pulsars, Gravitational Effects, Radio Astronomy, Stellar Luminosity, Time Measurement
Scientific paper
The discovery of a 110-ms pulsar, PSR2127+11, in the globular cluster M15, is reported. The results of nine months of timing measurements place the new pulsar about 2 arcsec from the center of the cluster, and indicate that it is not a member of a close binary system. The measured negative value of the period derivative is probably the result of the pulsar being bodily accelerated in our direction by the gravitational field of the collapsed core of M15. This apparently overwhelms a positive contribution to the period derivative due to magnetic braking. Although the pulsar has an unexpectedly long period, it is argued that it belongs to the class of 'recycled' pulsars, which have been spun up by accretion in a binary system. The subsequent loss of the pulsar's companion is probably due to disruption of the system by close encounters with other stars.
Backer Donald C.
Dewey Rachel J.
Fruchter Andrew S.
Kulkarni Sanjeev R.
Middleditch John
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