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Effects of Hardness of Primordial Binaries on Evolution of Star Clusters

Published online by Cambridge University Press:  01 September 2007

A. Tanikawa  and
T. Fukushige
A. Tanikawa
Affiliation:
Department of General System Studies, College of Arts and Sciences, University of Tokyo email: tanikawa@ea.c.u-tokyo.ac.jp
T. Fukushige
Affiliation:
K&F Computing Research Co. email: fukushig@kfcr.jp
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Abstract

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We performed N-body simulations of star clusters with primordial binaries using a new code, GORILLA. It is based on Makino and Aarseth (1992)'s integration scheme on GRAPE, and includes a special treatment for relatively isolated binaries. Using the new code, we investigated effects of hardness of primordial binaries on whole evolution of the clusters. We simulated seven N=16384 equal-mass clusters containing 10% (in mass) primordial binaries whose binding energies are 1, 3, 10, 30, 100, 300, and 1000kT, respectively. Additionally, we also simulated a cluster without primordial binaries and that in which all binaries are replaced by stars with double mass, as references of soft and hard limits, respectively. We found that, in both soft (≤ 3kT) and hard (≥ 1000kT) limits, clusters experiences deep core collapse and shows gravothermal oscillations. On the other hands, in the intermediate hardness (10-300kT), the core collapses halt halfway due an energy releases of the primordial binaries.

Keywords

globular clusters: generalmethod: n-body simulations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 251 - 255
Copyright
Copyright © International Astronomical Union 2008

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