The influence of initial mass segregation on the runaway merging of stars

Ardi, Eliani, Baumgardt, Holger and Mineshige, Shin (2008) The influence of initial mass segregation on the runaway merging of stars. Astrophysical Journal, 682 2: 1195-1204. doi:10.1086/589278

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Author Ardi, Eliani
Baumgardt, Holger
Mineshige, Shin
Title The influence of initial mass segregation on the runaway merging of stars
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 2008-08
Sub-type Article (original research)
DOI 10.1086/589278
Open Access Status File (Publisher version)
Volume 682
Issue 2
Start page 1195
End page 1204
Total pages 10
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Formatted abstract
We have investigated the effect of initial mass segregation on the runaway merging of stars. The evolution of multimass, dense star clusterswas followed bymeans of direct N-body simulations of up to 131,072 stars.All clusters started from King models with dimensionless central potentials of 3:0 ≤  W0 ≤ 9:0. Initial mass segregation was realized by varying the minimum mass of a certain fraction of stars whose either (1) distances were closest to the cluster center or (2) total energies were lowest. The second case is more favorable to promote the runaway merging of stars by creating a high-mass core of massive, low-energy stars. Initial mass segregation could decrease the central relaxation time and thus help the formation of a high-mass core. However, we found that initial mass segregation does not help the runaway stellar merger to happen if the overall mass density profile is kept constant. This is due to the fact that the collision rate of stars is not increased due to initial mass segregation. Our simulations show that initialmass segregation is not sufficient to allow runaway merging of stars to occur in clusters with central densities typical for star clusters
in the Milky Way.
Keyword Globular clusters : general
Methods : n-body simulations
Stellar dynamics
High resolution camera
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
ERA 2012 Admin Only
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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