Mathematics – Probability
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008acasn..49..376e&link_type=abstract
Acta Astronomica Sinica, vol. 49, no. 4, p. 376-386
Mathematics
Probability
Method: N-Body Simulations, Stars: Formation
Scientific paper
The initial condition of massive star formation is still a mystery. Especially, it is a matter of dispute whether massive stars are formed in the center of embedded clusters. In view of the short time-scale of embedded clusters, some people argue that mass segregation in embedded clusters serves as the key evidence that massive stars are formed in the center. We use Monte Carlo method to investigate the evolution of embedded clusters. Initially, all stars are distributed as n?r-2. We find that, during their dynamical evolution, many clusters will present temporary mass segregation because of the random motion of massive stars. Some of them show quite apparent mass segregation that is possible to be observed. This result suggests that mass segregation does not necessarily mean that massive stars form in the center of embedded clusters. Dynamical friction can effectively shorten the time-scale of mass segregation and increase the probability of temporary mass segregation in a certain period.
Er Xin-Yue
Fu Yan-Ning
Jiang Zhi-Bo
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