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

Abstract

We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival ACS 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 $\sim$0.05 to 0.11 for these three clusters. Model grids with solar $\alpha$-element abundances ([$\alpha$/Fe] =0.0) and enhanced $\alpha$-elements ([$\alpha$/Fe]=0.4) are adopted.

ApJ, 21 pages, 14 figures, 7 tables

References in corpus (19)

• The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. III. A quintuple stellar population in NGC2808
• Origin of multiple stellar populations in globular clusters and their helium enrichment
• The fraction of second generation stars in Globular Clusters from the analysis of the Horizontal Branch
• A maximum likelihood method for fitting colour-magnitude diagrams
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. II. The seven stellar populations of NGC7089 (M2)
• A General Abundance Problem for All Self-Enrichment Scenarios for the Origin of Multiple Populations in Globular Clusters
• Inverting Color-Magnitude Diagrams to Access Precise Star Cluster Parameters: A Bayesian Approach
• Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IV. Helium content and relative age of multiple stellar populations within NGC 6352
• Constraints on Helium Enhancement in the Globular Cluster M3 (NGC 5272): The Horizontal Branch Test
• Stellar Models of Multiple Populations in Globular Clusters. I. The Main Sequence of NGC 6752
• A robust statistical estimation of the basic parameters of single stellar populations. I. Method
• Multiple Populations in Globular Clusters and the Origin of the Oosterhoff Period Groups
• Stellar abundances and ages for metal-rich Milky Way globular clusters - Stellar parameters and elemental abundances for 9 HB stars in NGC6352
• Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters I: Statistical and Computational Methods
• Bayesian Investigation of Isochrone Consistency Using the Old Open Cluster NGC 188
• Bayesian Analysis for Stellar Evolution with Nine Parameters (BASE-9): User's Manual

Cited by in corpus (7)

• The ACS Survey of Galactic Globular Clusters XIV: Bayesian Single-Population Analysis of 69 Globular Clusters
• RR Lyrae variables in Messier 53: Near-infrared Period--Luminosity relations and the calibration using Gaia Early Data Release 3
• Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters I: Statistical and Computational Methods
• Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters III: Analysis of 30 Clusters
• New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data
• A Multi-Wavelength Study of the Segue 3 Cluster
• The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS) II: Characterization of 47 Tuc with Bayesian Statistics