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Stellar populations in globular cluster cores: evidence for a peculiar trend among red giant branch stars

Leigh, N., Sills, A. and Knigge, C. (2009) Stellar populations in globular cluster cores: evidence for a peculiar trend among red giant branch stars Monthly Notices of the Royal Astronomical Society: Letters, 399, (1), L179-L183. (doi:10.1111/j.1745-3933.2009.00749.x).

Record type: Article

Abstract

We investigate the relationship between the mass of a globular cluster core and the sizes of its various stellar populations in a sample of 56 globular clusters. The number of core red giant branch stars is found to scale sub-linearly with core mass at the 3? confidence level, whereas the relation is linear to within one standard deviation for main-sequence turn-off (MSTO) and sub-giant branch stars.

We interpret our results as evidence for a surplus of red giant branch stars in the least massive cluster cores which is not seen for MSTO and sub-giant branch stars. We explore various possibilities for the source of this discrepancy, discussing our results primarily in terms of the interplay between the cluster dynamics and stellar evolution.

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Published date: October 2009
Keywords: stellar dynamics, stars, evolution, statistics, globular clusters, general

Identifiers

Local EPrints ID: 144165
URI: http://eprints.soton.ac.uk/id/eprint/144165
ISSN: 1745-3933
PURE UUID: 4e3ef2ec-b31b-4cc1-910e-2a7a45a19b8f

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Date deposited: 16 Apr 2010 15:50
Last modified: 18 Jul 2017 23:08

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Contributors

Author: N. Leigh
Author: A. Sills
Author: C. Knigge

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