Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115106g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #151.06; Bulletin of the American Astronomical Society, Vol. 39, p.1003
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a Boltzmann scheme for studying evolution of compact-binary populations in globular clusters, wherein dynamical formation processes like tidal capture and exchange encounters, and destruction processes like dissociation are included, as are binary-hardening processes. For those processes which are stochastic, we study the continuous limit first, and then introduce our model for stochasticity.
We show that the continuous limit is indeed an excellent representation of the average of many ``realizations'' of stochastic calculations. We focus on the evolution of the number of X-ray binaries N_{XB} in globular clusters, and their orbital period distribution. We explore the dependence of N_{XB} on two essential globular-cluster parameters characterizing star-star and star-binary encounter rates, which we call Verbunt parameters. We show that our computed trends in N_{XB} with the Verbunt parameters are in good agreement with recent CHANDRA data on Galactic globular-cluster X-ray binaries.
Banerjee Sambaran
Ghosh Pranab
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