Effects of Hardness of Primordial Binaries on Evolution of Star Clusters

Details Effects of Hardness of Primordial Binaries on Evolution of Star Clusters Effects of Hardness of Primordial Binaries on Evolution of Star Clusters

2010-05-13

arxiv.org/abs/1005.2237v1

PASJ, 61 (2009), 721-736

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Scientific paper

We investigate effects of hardness of primordial binaries on whole evolution of star clusters by means of N-body simulations. Using newly developed code, GORILLA, we simulated eleven N=16384 clusters with primordial binaries whose binding energies are equal in each cluster in range of 1-300kT_0, where 1.5kT_0 is average stellar kinetic energy at the initial time. We found that, in both soft (< 3kT_0) and hard (> 300kT_0) limits, clusters experience deep core collapse. In the intermediate hardness (10-100kT_0), the core collapses halt halfway due to an energy releases of the primordial binaries. The core radii at the halt can be explained by their energy

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