期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 61, 期 4, 页码 721-736出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/61.4.721
关键词
celestial mechanics; galaxies: star clusters; stellar dynamics
资金
- Japan Society for the Promotion of Science [JSPS-RFTF97P01102, 14740127]
- Ministry of Education, Culture, Sports, Science and Technology [16684002]
- Grants-in-Aid for Scientific Research [16684002, 14740127] Funding Source: KAKEN
We have investigated the effects of the hardness of primordial binaries on the whole evolution of star clusters by means of N-body simulations. Using a newly developed code, GORILLA, we simulated eleven N = 16384 clusters with primordial binaries whose binding energies are equal in each cluster in the range of 1-300 kT(0), where 1.5 kT(0) is the average stellar kinetic energy at the initial time. We found that, in both the soft (<= 3 kT(0)) and hard (>= 300 kT(0)) limits, clusters experience deep core collapse. For intermediate hardness (10-100 kT(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 budget.
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