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The ACS Survey of Galactic Globular Clusters XIV: Bayesian Single-Population Analysis of 69 Globular Clusters

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Title: 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, DC
Van Dyk, DA
Jeffrey, E
Robinson, E
Stein, N
Anderson, J
Jefferys, WH
Item Type: Journal Article
Abstract: 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.
Issue Date: 3-Mar-2017
Date of Acceptance: 28-Feb-2017
URI: http://hdl.handle.net/10044/1/51701
DOI: https://dx.doi.org/10.1093/mnras/stx544
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 1038
End Page: 1055
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 468
Issue: 1
Copyright Statement: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copy-editing, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version R. Wagner-Kaiser, A. Sarajedini, T. von Hippel, D. C. Stenning, D. A. van Dyk, E. Jeffery, E. Robinson, N. Stein, J. Anderson, W. H. Jefferys; The ACS survey of Galactic globular clusters – XIV. Bayesian single-population analysis of 69 globular clusters, Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 1, 11 June 2017, Pages 1038–1055, is available online at: https://dx.doi.org/10.1093/mnras/stx544
Sponsor/Funder: The Royal Society
Commission of the European Communities
Funder's Grant Number: WM110023
FP7-PEOPLE-2012-CIG-321865
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Hertzsprung
Russell and colour
magnitude diagrams
Galaxy: formation
globular clusters: general
HUBBLE-SPACE-TELESCOPE
2 STELLAR POPULATIONS
COLOR-MAGNITUDE DIAGRAMS
HORIZONTAL-BRANCH MORPHOLOGY
AGE-METALLICITY RELATION
WHITE-DWARF AGE
OMEGA-CENTAURI
MULTIPLE POPULATIONS
ABUNDANCE VARIATIONS
LUMINOSITY FUNCTION
astro-ph.SR
astro-ph.GA
0201 Astronomical And Space Sciences
Publication Status: Published
Appears in Collections:Mathematics
Statistics
Faculty of Natural Sciences



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