Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 468, Issue 1, Pages 1038-1055Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx544
Keywords
Hertzsprung; Russell and colour; magnitude diagrams; Galaxy: formation; globular clusters: general
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Funding
- NASA through Space Telescope Science Institute [NAS5-26555]
- National Aeronautics and Space Administration issued through the Office of Space Science and through the University of Central Florida's NASA Florida Space Grant Consortium [NNX11AF34G]
- NSF [DMS 1208791]
- Wolfson Research Merit Award [WM110023]
- European Commission [FP7PEOPLE-2012-CIG-321865, H2020-MSCA-RISE-2015-691164]
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We use Hubble Space Telescope (HST) imaging from the ACS Treasury Survey to determine fits for single population isochrones of 69 Galactic globular clusters. Using robust Bayesian analysis techniques, we simultaneously determine ages, distances, absorptions and helium values for each cluster under the scenario of a 'single' stellar population on model grids with solar ratio heavy element abundances. The set of cluster parameters is determined in a consistent and reproducible manner for all clusters using the Bayesian analysis suite BASE-9. Our results are used to re-visit the age-metallicity relation. We find correlations with helium and several other parameters such as metallicity, binary fraction and proxies for cluster mass. The helium abundances of the clusters are also considered in the context of carbon, nitrogen, and oxygen abundances and the multiple population scenario.
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