The effect of the dynamical state of clusters on gas expulsion and infant mortality

被引：61
作者：
Goodwin, Simon P. [1 ]
机构：
[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2009年 / 324卷 / 2-4期
关键词：
Open clusters and associations: general; Galaxies: star clusters; STELLAR CLUSTERS; MASS FUNCTION; EVOLUTION; CLOUDS; POPULATION; REMOVAL; ORIGIN; SYSTEM;
D O I：
10.1007/s10509-009-0116-5
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The star-formation efficiency (SFE) of a star cluster is thought to be the critical factor in determining if the cluster can survive for a significant (> 50 Myr) time. There is an often quoted critical SFE of similar to 30% for a cluster to survive gas expulsion. I reiterate that the SFE is not the critical factor; rather, it is the dynamical state of the stars (as measured by their virial ratio) immediately before gas expulsion. If the stars in a star cluster are born in an (even slightly) cold dynamical state, then the survivability of a cluster can be greatly increased.
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页码：259 / 263
页数：5
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