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Globular Cluster Systems in Brightest Cluster Galaxies: Bimodal Metallicity Distributions and the Nature of the High-Luminosity Clusters
W. E. Harris, B. C. Whitmore, D. Karakla +4
We present new (B,I) photometry for the globular cluster systems in eight Brightest Cluster Galaxies (BCGs), obtained with the ACS/WFC camera on the Hubble Space Telescope. In the…
The Luminosity Function and Mass Function in the Galactic Bulge
Jon A. Holtzman, Alan M. Watson, William A. Baum +5
We present deep photometry obtained with the Hubble Space Telescope (HST) in a field in Baade's Window in the Galactic bulge. We derive a luminosity function down to I ~ 24.3, or V…
The Distance to the Coma Cluster from Surface Brightness Fluctuations
Bjarne Thomsen, William A. Baum, Mark Hammergren +1
We report on the first determination of the distance to the Coma Cluster based on surface brightness fluctuation (SBF) measurements obtained from Hubble Space Telescope WFPC2 obser…
Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram
Carl J. Grillmair, Tod R. Lauer, Guy Worthey +9
We present a V-I color-magnitude diagram for a region 1'-2' from the center of M32 based on Hubble Space Telescope WFPC2 images. The broad color-luminosity distribution of red gian…
Hubble Space Telescope Observations of Globular Clusters in M31 II: Structural Parameters
C. J. Grillmair, E. A. Ajhar, S. M. Faber +5
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 cou…