Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7606g&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #76.06; Bulletin of the American Astronomical Society, Vol. 26, p.1434
Astronomy and Astrophysics
Astronomy
Scientific paper
We analyze post-refurbishment Hubble Space Telescope images of four globular clusters in M31. The ability to resolve stars in these images to below the horizontal branch permits us to use star counts to significantly extend surface brightness profiles determined using aperture photometry. By selecting stars on the basis of magnitude and color, and by taking account of the gradient in the surface density of field stars due to the halo of M31, we are able to extend the profiles to over 5 orders of magnitude in surface density. As in the majority of Galactic globular clusters, the resulting profiles resemble King models, though the uncertainties in the fitted tidal radii are large. Core radii are measured taking account of the WFPC2 Point-Spread-Function, and the values we find are consistent with the range of core radii measured for globular clusters in our own Galaxy. Two-dimensional surface brightness profiles indicate significant ellipticity in the isophotes of two of our clusters.
Ajhar Edward A.
Baum William A.
Faber Sandra M.
Grillmair Carl J.
Holtzman Jon A.
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