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Session 3 - Clusters.
Display session, Monday, June 10
Tripp Commons,
We have used the Wide Field Planetary Camera 2 on the Hubble Space Telescope to image star clusters in the nearby spiral galaxy M33. Our observations consist of 4800s of exposure time in F555W and 5200s of exposure time in F814W. The telescope was dithered slightly between the two CR-SPLIT exposures in each filter. The images have been reduced with DAOPHOT/ALLSTAR/ALLFRAME using PSFs constructed as part of the ``Cepheid Distance Scale'' key project. The photometric calibration has also been provided by this key project. We will present color-magnitude diagrams for the star clusters observed to date as well as the field regions around these clusters. We use these diagrams to estimate abundances, abundance spreads, reddenings, and distances to these systems. Support for this work is provided by NASA grant numbers HF-01077.01-94A and GO-05914.01-94A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555.
