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Evolution of Globular Clusters by Tidally-Captured Binaries through Core Collapse

Published online by Cambridge University Press:  19 July 2016

Thomas S. Statler
Affiliation:
Princteon University Observatory
Jeremiah P. Ostriker
Affiliation:
Princteon University Observatory
Haldan N. Cohn
Affiliation:
Indiana University

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We present calculations of globular cluster evolution performed by a modified Fokker-Planck approach, in which binaries formed by tidal capture are followed explicitly, along with subsequent heating mechanisms. The cluster is simulated by a two component model, using the cross sections of Press and Teukolsky (1977) for tidal capture, those of Hut (1984) for the single-binary encounters and for distant binary-binary encounters, and those of Mikkola (1983) for the strong binary-binary encounters. The initial state of the cluster is a Plummer model with N = 3 × 105 and scale radius ro = 1.13 pc. All stars are identical, with mass M = 0.7M and R = 0.57R. This gives an initial core radius rc = 0.8 pc, and one-dimensional dispersion σ = 11.6 km s-1. All binaries are assumed to be identical, with separation a = 2.5R. There are no binaries in the cluster initially. Additional important effects, such as tidal truncation, tidal shocks, stellar evolution and mass loss, and stellar mergers, are not included.

Type
Chapter X. Poster Papers on Formation and Evolution of Globular Clusters
Copyright
Copyright © Kluwer 1988