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).
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Description/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 3σ 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.
| Item Type: | Article |
|---|---|
| ISSNs: | 1745-3925 (print) |
| Related URLs: | |
| Keywords: | stellar dynamics, stars, evolution, stars, statistics, globular clusters, general |
| Subjects: | Q Science > Q Science (General) |
| Divisions: | University Structure - Pre August 2011 > School of Physics and Astronomy > Astronomy and Space Science |
| Item ID: | 144165 |
| Date Deposited: | 16 Apr 2010 15:50 |
| Last Modified: | 01 Jun 2011 03:11 |
| Contributors: | Leigh, N. (Author) Sills, A. (Author) Knigge, C. (Author) |
| Date: | October 2009 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/144165 |
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