Leigh, N., Sills, A. and Knigge, C.
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), . (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 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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