The Main Sequence Luminosity Function of Palomar 5

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Hst Proposal Id #6788 Stellar Populations

Scientific paper

Palomar 5 appears to represent an extreme in the dynamical evolution of globular clusters. A low mass, large core radius, and a low central concentration suggest that Pal 5 has lost a large fraction of it's initial mass and has expanded as a consequence. If the dynamical evolution of Pal 5 has been dominated by the effects of star loss, then theoretical arguments suggest that the stellar mass function should be deficient in low-mass stars. From a dynamical study of NGC 5466 Pryor et al. concluded that the best fitting King-Michie models for that cluster are those which have a cutoff in the stellar mass function at about 0.4 solar masses. A similar or even more extreme truncation in the Pal 5 mass function is possible. We propose to directly test this conclusion by determining the stellar luminosity function of Pal 5 down to V = 27.0 from WFPC2 F555W and F814W frames. Two fields within Pal 5 will be observed, one located near the cluster center and the other just within the half-light radius. A magnitude of V = 27.0 in Pal 5 corresponds to a stellar mass of about 0.3 solar masses, which is fainter than the predicted truncation mass.

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