Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6185j&link_type=abstract
HST Proposal ID #6185
Physics
Hst Proposal Id #6185 Stellar Populations
Scientific paper
We propose the first proper motion study of the bulge, to magnitude below its turnoff and into the main sequence, by using HST archival data as first epoch exposures and by obtaining a new series of second epoch exposures within Baade's low-extinction window. By using recently developed centering routines specifically designed to deal with crowded fields taken with the HST, we expect to obtain a mean positional accuracy of 5 milli-arc-seconds per object which at the Galactic center, translates into a tangential velocity error of 20 km/sec. Since typical velocity dispersions in the bulge are on the order of 110 km/sec, we have a good velocity resolution to determine the intrinsic kinematical properties of the Bulge. A Galactic Structure modelling code will be used to aid in the interpretation of the proper motion distributions in terms of a physically-relevant kinematical description of the bulge and the foreground disk, therefore avoiding simplistic assumptions about the distribution of stars along the line of sight as done in previous studies.
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