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We use Cycle 21 Hubble Space Telescope (HST) observations and HST archivalACS Treasury observations of Galactic Globular Clusters to find andcharacterize two stellar populations in NGC 5024 (M53), NGC 5272 (M3), and NGC6352. For these three clusters, both single and double-population analyses areused to determine a best fit isochrone(s). We employ a sophisticated Bayesiananalysis technique to simultaneously fit the cluster parameters (age, distance,absorption, and metallicity) that characterize each cluster. For thetwo-population analysis, unique population level helium values are also fit toeach distinct population of the cluster and the relative proportions of thepopulations 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.

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