A Bayesian Analysis of the Ages of Four Open Clusters

Abstract

In this paper we apply a Bayesian technique to determine the best fit of stellar evolution models to find the main sequence turn off age and other cluster parameters of four intermediate-age open clusters: NGC 2360, NGC 2477, NGC 2660, and NGC 3960. Our algorithm utilizes a Markov chain Monte Carlo technique to fit these various parameters, objectively finding the best-fit isochrone for each cluster. The result is a high-precision isochrone fit. We compare these results with the those of traditional "by-eye" isochrone fitting methods. By applying this Bayesian technique to NGC 2360, NGC 2477, NGC 2660, and NGC 3960, we determine the ages of these clusters to be 1.35 +/- 0.05, 1.02 +/- 0.02, 1.64 +/- 0.04, and 0.860 +/- 0.04 Gyr, respectively. The results of this paper continue our effort to determine cluster ages to higher precision than that offered by these traditional methods of isochrone fitting.

13 pages, 8 figures, published in ApJ

References in corpus (4)

• The Dartmouth Stellar Evolution Database
• Inverting Color-Magnitude Diagrams to Access Precise Star Cluster Parameters: A Bayesian Approach
• Methods for improving open cluster fundamental parameters applied to M 52 and NGC 3960
• Bayesian Investigation of Isochrone Consistency Using the Old Open Cluster NGC 188

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• MiMO: Mixture Model for Open Clusters in Color-Magnitude Diagrams
• Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters III: Analysis of 30 Clusters
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