Hubble Space Telescope Observations of Globular Clusters in M31 II: Structural Parameters

Abstract

We analyze post-refurbishment Hubble Space Telescope images of four globular clusters in M31. The ability to resolve stars to below the horizontal branch permits us to use star counts to extend the surface brightness profiles determined using aperture photometry to almost 5 orders of magnitude below the central surface density. Three of the resulting cluster profiles are reasonably well-fit using single-mass King models, with core and tidal radii typical of those seen in Galactic globular clusters. We confirm an earlier report of the discovery of a cluster which has apparently undergone core collapse. Three of the four clusters show departures in their outskirts from King model behavior which, based on recent results for Galactic globulars, may indicate the presence of tidal tails.

15 pages, 10 tables, 8 postscript figures, aaspp4.sty, flushrt.sty, and aj_pt.sty included, accepted for publication in the Astronomical Journal

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