The Effect of Pre-Main Sequence Stars on Star Cluster Dynamics

Details The Effect of Pre-Main Sequence Stars on Star Cluster Dynamics The Effect of Pre-Main Sequence Stars on Star Cluster Dynamics

2005-10-07

arxiv.org/abs/astro-ph/0510225v1

Astrophys.J.637:838-849,2006

Astronomy and Astrophysics

Astrophysics

40 pages ApJ preprint style Accepted by ApJ

Scientific paper

10.1086/498562

We investigate the effects of the addition of pre-main sequence evolution to star cluster simulations. We allowed stars to follow pre-main sequence tracks that begin at the deuterium burning birthline and end at the zero age main sequence. We compared our simulations to ones in which the stars began their lives at the zero age main sequence, and also investigated the effects of particular choices for initial binary orbital parameters. We find that the inclusion of the pre-main sequence phase results in a slightly higher core concentration, lower binary fraction, and fewer hard binary systems. In general, the global properties of star clusters remain almost unchanged, but the properties of the binary star population in the cluster can be dramatically modified by the correct treatment of the pre-main sequence stage.

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