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Multiple populations in globular clusters: constraints from kinematics and dynamics

Published online by Cambridge University Press:  31 March 2017

Vincent Hénault-Brunet
Vincent Hénault-Brunet*
Affiliation:
Department of Physics, University of Surrey, GU2 7XH, Guildford, UK email: v.henault-brunet@surrey.ac.uk
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Abstract

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We discuss constraints on the formation of multiple populations in globular clusters (GCs) imposed by their present-day kinematics (velocity dispersion and anisotropy) and spatial distribution. We argue that the observational evidence collected so far in the outer parts of clusters is generally consistent with an enriched population forming more centrally concentrated compared to the primordial population, in agreement with all the scenarios proposed to date (in some cases by design), but not sufficient to favour a particular scenario. We highlight that the differential rotation of subpopulations is a signature that may provide crucial new constraints and allow us to distinguish between various scenarios. Finally, we discuss the spatial distribution of subpopulations in the central regions of GCs and speculate that mass segregation between subpopulations may be due to a difference in their binary fraction.

Keywords

star clustersglobular clusters: generalstars: kinematicsGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 310 - 315
Copyright
Copyright © International Astronomical Union 2017 

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