Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters. II. NGC 5024, NGC 5272, and NGC 6352

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Title: Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters. II. NGC 5024, NGC 5272, and NGC 6352
Authors: Wagner-Kaiser, R
Stenning, D
Robinson, E
Von Hippel, T
Sarajedini, A
Van Dyk, DA
Stein, N
Jefferys, WH
Item Type: Journal Article
Abstract: We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival Advanced Camera for Surveys Treasury observations of Galactic Globular Clusters to find and characterize two stellar populations in NGC 5024 (M53), NGC 5272 (M3), and NGC 6352. For these three clusters, both single and double-population analyses are used to determine a best fit isochrone(s). We employ a sophisticated Bayesian analysis technique to simultaneously fit the cluster parameters (age, distance, absorption, and metallicity) that characterize each cluster. For the two-population analysis, unique population level helium values are also fit to each distinct population of the cluster and the relative proportions of the populations are determined. We find differences in helium ranging from ~0.05 to 0.11 for these three clusters. Model grids with solar α-element abundances ([α/Fe] = 0.0) and enhanced α-elements ([α/Fe] = 0.4) are adopted.
Issue Date: 18-Jul-2016
Date of Acceptance: 3-Feb-2016
ISSN: 1538-4357
Publisher: American Astronomical Society
Journal / Book Title: Astrophysical Journal
Volume: 826
Issue: 1
Copyright Statement: © 2016 The American Astronomical Society. All rights reserved.
Sponsor/Funder: The Royal Society
Commission of the European Communities
Funder's Grant Number: WM110023
Keywords: Astronomy & Astrophysics
Astronomical And Space Sciences
Organic Chemistry
Physical Chemistry (Incl. Structural)
Publication Status: Published
Article Number: 42
Appears in Collections:Mathematics
Faculty of Natural Sciences

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