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

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

1996-02-09

arxiv.org/abs/astro-ph/9602047v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/117963

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.

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