Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8696f&link_type=abstract
HST Proposal ID #8696
Physics
Hst Proposal Id #8696 Stellar Populations
Scientific paper
We propose to obtain second epoch WFPC2 observations of the Galactic globular cluster NGC 6528. These will be used to obtain proper motions of the cluster relative to the background bulge field and thus provide, for the first time, a colour-magnitude diagram of NGC 6528 free from background stars. NGC 6528 is perhaps the most metal-rich globular cluster known and as such serves as an invaluable template for calibrating and understanding metal-rich stellar populations in extra-galactic bulges and disks, as well as serving as a template in studies of our own Galactic Bulge. Observations of this cluster are, however, severely hampered by it being superimposed on and physically close to the Galactic Bulge itself, resulting in a colour-magnitude diagram made up of Bulge and cluster stars. Thus the images currently available in the HST-archive are of limited, if any, use as a template for metal-rich stellar populations. Proper-motion studies of globular clusters, eg. NGC 6379, have proved extremely efficient in cleaning the CMD from field stars.
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