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Comparison of X-Ray Sources in Old Open and in Globular Clusters

Published online by Cambridge University Press:  25 May 2016

Frank Verbunt
Frank Verbunt*
Affiliation:
Astronomical Institute, Utrecht University, Postbox 80.000, 3508 TA Utrecht, the Netherlands ([email protected])

Abstract

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Twelve bright (Lx ≳ 1036erg/s) X-ray sources have been detected in globular clusters: they are accreting neutron stars. Five of these are transients. Thirty less luminous sources have been detected in eighteen globular clusters. The luminosity function of these sources does not rise rapidly towards lower luminosities. The sources with Lx ∼ 1033 erg/s are probably transients in their low state; the least luminous sources currently detected may be cataclysmic variables. The old open cluster M 67 harbours chromospherically active binaries, with Lx ∼ 1030−31erg/s. Globular clusters contain fewer of these binaries than estimated by scaling with mass from M 67.

Type
August 25: X Ray and Compact Objects in Globular Clusters
Information
Symposium - International Astronomical Union , Volume 174: Dynamical Evolution of Stars Clusters , 1996 , pp. 183 - 192
Copyright
Copyright © Kluwer 1996 

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