Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44..227s&link_type=abstract
Astronomy and Astrophysics, vol. 44, no. 1, Nov. 1975, p. 227-230.
Astronomy and Astrophysics
Astronomy
37
Binary Stars, Capture Effect, Globular Clusters, X Ray Stars, Black Holes (Astronomy), Giant Stars, Main Sequence Stars, Many Body Problem, Neutron Stars, Stellar Evolution
Scientific paper
The possibility is examined that the globular cluster X-ray sources are binaries with a compact (neutron star or black hole) component which were formed by direct collisions between compact stars and giant branch stars in the clusters. It is argued that such a collision will lead to capture of the compact star and to the formation of an X-ray binary that may live for some 1 b.y. The anticipated number of about 20,000 compact stars in the globular cluster M 3 produces a few collisions with giant branch stars in one trillion years. In the densest globular clusters this frequency can be a few collisions per 10 b.y. Such a frequency is sufficient to explain the observed frequency of occurrence of globular cluster X-ray sources. X-ray sources produced by such collisions are not necessarily to be confined to the central region of the clusters.
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