VIOLENT RELAXATION IN ISOLATED STAR CLUSTERS

Bekdaulet Shukirgaliyev, v@nu.edu.kz, A. Otebay, A. Just, Dr.rer.nat, prof. Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut;, Peter Berczik, Chingis T. Omarov, A. Naurzbayeva, M. Kalambay

2019

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DOI 10.32014/2019.2518-1726.32
Data confidence 70 medium
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Abstract

We study the effect of initial mass function and stellar evolution on the survivability of isolated star clusters after instantaneous gas expulsion.Our model clusters form with a centrally peaked star-formation efficiency profile according to the local-density-driven cluster formation model.We perform directstar clusters with global star-formation efficiencies ranging from 0.13 to 0.50.We have found that the stellar evolutionary mass-loss does not affect the number of bound stars of star clusters with high global SFE ( 2 .0  gl SFE), and the decrease in final bound mass fraction is only due to stellar evolution.But star clusters with lower global SFE are affected more by stellar evolutionary mass-loss and survive with less number of stars than if it would consist of single-mass non-evolving stars.High-SFE clusters also do not expand much after violent relaxation, while clusters with 15 .0  gl SFE and 0.20 expand significantly.The global SFE as low as 30 .0  gl SFEis sufficient for a cluster to almost keep its mass and size at the time of gas expulsion in our models.