The globular cluster population of X-ray binaries

Details The globular cluster population of X-ray binaries The globular cluster population of X-ray binaries

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986bist.nasar....v&link_type=abstract

In its Binary Stars 10 p (SEE N87-16726 08-90)

Physics

Binary Stars, Globular Clusters, Star Clusters, Stellar Mass Accretion, X Ray Sources, Pulsars, Star Distribution, Stellar Luminosity, Stellar Models

Scientific paper

Formation mechanisms for low-mass X-ray binaries in globular clusters are discussed. Tidal capture in close two-body encounters between neutron and main-sequence stars is applied to the clusters of our galaxy. The observed number of X-ray sources in these can be explained if the birth velocities of neutron stars are higher than estimated from velocity measurements of radiopulsars, or if the initial mass function steepens at high masses. A statistical test on the distribution of X-ray sources with respect to the number of close encounters in globular clusters reveals agreement between the tidal capture theory and observation, apart from the presence of low-mass X-ray binaries in clusters with a very low encounter rate: Ter 1, Ter 2, Gr 1, and NGC 6712. Observations of EXOSAT indicate that dim globular cluster sources may be less luminous than hitherto assumed, and support the view that the brighter dim sources may be soft X-ray transients in quiescence.

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