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The apparent age and mass of a stellar cluster can be strongly affected bystochastic sampling of the stellar initial mass function, when inferred fromthe integrated color of low mass clusters (less than ~10^4 solar masses). Weuse simulated star clusters to show that these effects are minimized when thebrightest, rapidly evolving stars in a cluster can be resolved, and the lightof the fainter, more numerous unresolved stars can be analyzed separately. Whencomparing the light from the less luminous cluster members to models ofunresolved light, more accurate age estimates can be obtained than whenanalyzing the integrated light from the entire cluster under the assumptionthat the initial mass function is fully populated. We show the success of thistechnique first using simulated clusters, and then with a stellar cluster inM31. This method represents one way of accounting for the discrete, stochasticsampling of the stellar initial mass function in less massive clusters and canbe leveraged in studies of clusters throughout the Local Group and other nearbygalaxies.

The Panchromatic Hubble Andromeda Treasury III. Measuring Ages and Masses of Partially Resolved Stellar Clusters