Neutron star/red giant encounters in globular clusters

Details Neutron star/red giant encounters in globular clusters Neutron star/red giant encounters in globular clusters

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.332..330b&link_type=abstract

Nature (ISSN 0028-0836), vol. 332, March 24, 1988, p. 330-332. NSF-supported research.

Astronomy and Astrophysics

Astronomy

22

Globular Clusters, Neutron Stars, Red Giant Stars, Astronomical Models, Gravitational Fields, Main Sequence Stars, Pulsars

Scientific paper

It has been suggested that the tidal capture of a red giant by a neutron star in globular clusters may result in bound systems. However, the binding energy of the envelope of a giant is much less than that of a main-sequence star, so that ratio x(crit) will be less for giants than for main-sequence stars. A simple expression is presented here for the amount by which x(crit) is diminished as a star evolves, and it is concluded that tidal capture of giants by neutron stars resulting in binary systems in unlikely in globular clusters. However, collisions between neutron stars and red giants, or an alternative process involving tidal capture of a main-sequence star into an initially detached binary system, may result either in rapidly rotating neutron stars or in white dwarf/neutron star binaries.

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