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Observational evidence for origin of stellar exotica in globular clusters

Published online by Cambridge University Press:  01 August 2006

Franciscus W.M. Verbunt
Franciscus W.M. Verbunt*
Affiliation:
Astronomical Institute, Utrecht University, the Netherlands email: f.w.m.verbunt@astro.uu.nl
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Abstract

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The formation of special binaries in a globular cluster is regulated by the total encounter rate γ in the cluster, but their life expectancy by the number of encounters γ that one system experiences. The orbital periods indicate whether a neutron star or white dwarf entered a binary via direct collision, via tidal capture, or via exchange encounter. The numbers of X-ray binaries with a neutron star scales with γ. Magnetically active binaries (including blue stragglers) are formed via evolution of primordial binaries, and their numbers scale with the cluster mass. Cataclysmic variables are formed by stellar encounters or via evolution of a primordial binary in clusters with high and low central density, respectively.

Keywords

globular clustersbinariesX-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Highlights of Astronomy 14: Highlights of Astronomy , August 2006 , pp. 440 - 441
Copyright
Copyright © International Astronomical Union 2007

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