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The tidal tails of open star clusters produced by early gas expulsion

Published online by Cambridge University Press:  11 March 2020

František Dinnbier Open the ORCID record for František Dinnbier [Opens in a new window]  and
Pavel Kroupa Open the ORCID record for Pavel Kroupa [Opens in a new window]
František Dinnbier
Affiliation:
I.Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: [email protected]
Pavel Kroupa
Affiliation:
Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Nussallee 14-16, 53115 Bonn, Germany email: [email protected] Charles University in Prague, Faculty of Mathematics and Physics, Astronomical Institute, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
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Abstract

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We investigate, for the first time, the formation and evolution of the tidal tail released from a young Pleiades-like star cluster due to expulsion of primordial gas in a realistic gravitational field of the Galaxy. The tidal tails (as well as clusters) are integrated by nbody6 from their embedded phase for more than 300 Myr. We vary the star formation efficiency (SFE) from 33% to 100% and the timescales of gas expulsion as free parameters, and provide predictions for the morphology and kinematics of the evolved tail for each of the models. The resulting tail properties are intended for comparison with Gaia measurements, where an inverse analysis of our findings might constrain some of the poorly understood conditions and processes in embedded star clusters during the gas phase and gas expulsion.

Keywords

open clusters and associations: generalopen clusters and associations: individual (the Pleiades)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 192 - 196
Copyright
© International Astronomical Union 2020

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