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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742377.0, MPI für Astronomie / Publikationen_mpia
The ACS survey of Galactic globular clusters - XIV. Bayesian single-population analysis of 69 globular clusters
Authors:Wagner-Kaiser, R.; Sarajedini, A.; von Hippel, T.; Stenning, D. C.; van Dyk, D. A.; Jeffery, E.; Robinson, E.; Stein, N.; Anderson, J.; Jefferys, W. H.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:468
Issue / Number:1
Start Page:1038
End Page:1055
Audience:Not Specified
Abstract / Description: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.
Free Keywords:Hertzsprung-Russell and colour-magnitude diagrams; Galaxy: formation; globular clusters: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711
URL:http://adsabs.harvard.edu/abs/2017MNRAS.468.1038W
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