AAS 201st Meeting, January, 2003
Session 108. Old Stellar Populations
Oral, Wednesday, January 8, 2003, 2:00-3:30pm, 618-619

## [108.03D] Hubble Space Telescope Observations of Collapsed Core Globular Clusters

S. Slavin (Purdue University Calumet; Indiana University)

The Galactic globular clusters NGC~6284 and NGC~6293 were determined in a ground-based survey by Lugger et al. (1995) to have collapsed cores with core radii of less than 1''. The \textit{Hubble Space Telescope} (\textit{HST}) \textit{Wide Field Planetary Camera 2} was used to image the cores of these clusters in the \textit{HST} filter equivalents of \textit{U}, \textit{B} and \textit{V}.

These photometric data were analyzed to determine the radial structure characteristics and color-magnitude diagram morphologies of these clusters. Extensive artificial star tests were performed to quantify the precision and completeness of the photometry. The overall goal of this work was to determine the underlying structure of the cluster cusps and their constituent luminous and dark stellar populations. The results of this dissertation project will be presented, and the conclusions reached will be discussed. Of particular interest are the blue straggler distributions and the results of a maximum-likelihood analysis of the radial structure as a power-law with core'' parameterization.