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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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.
|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
|Date Deposited:||16 Apr 2010 15:50|
|Last Modified:||01 Jun 2011 03:11|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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