Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2617m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #26.17; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on a program of N-body simulations of star cluster evolution that is being carried on GRAPE6 systems at Indiana University and Purdue University Calumet. We are simulating idealized star clusters that evolve well beyond core collapse both with and without a primordial population of hard binaries. The goal of this work is to understand the evolution of an X-ray binary population in the environment of a collapsed-core globular cluster such as M15, M30, or NGC 6397. Combined Hubble and Chandra observations of these clusters have revealed substantial populations of X-ray binaries, with spatial distributions that extend well outside of the collapsed cores where the these binaries are likely to be formed by dynamical interactions. Thus, we are investigating the evolution of the spatial distribution of the binary distribution with a particular focus on the diffusion of hard binaries to increasingly large radial offsets from the cluster center. We find a correlation between binary age and its location within the cluster, consistent with the observation that the lower luminosity, older cataclysmic variables in NGC 6397 are typically located farther from the cluster center than the higher luminosity, younger ones.
Cohn Haldan N.
Lugger Phyllis Minnie
Maxwell James Edward
Slavin Shawn D.
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