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On the Efficiency of Field Star Capture by Star Clusters

Published online by Cambridge University Press:  01 September 2007

S. Mieske  and
H. Baumgardt
S. Mieske
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str.2, 85748 Garching b. München, Germany email: [email protected], [email protected]
H. Baumgardt
Affiliation:
Argelander Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany email: [email protected]
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Abstract

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An exciting recent finding regarding scaling relations among globular clusters is the so-called ‘blue tilt’: clusters of the blue sub-population follow a trend of redder colour with increasing luminosity. In this contribution we estimate by means of collisional N-body simulations to which extent this trend can be explained by field star capture occurring over a Hubble time. We investigate star clusters with 103 to 106 stars. We find that the ratio between captured field stars and total number of clusters stars is very low (≲ 10−4), even for co-rotation of the star cluster in a cold disk. This holds for star clusters in the mass range of both open clusters and globular clusters. Therefore, field star capture is not a probable mechanism for creating the colour-magnitude trend of metal-poor globular clusters.

Keywords

globular clusters: generalopen clusters and associations: generalstars: kinematicsgalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 195 - 196
Copyright
Copyright © International Astronomical Union 2008

References

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