Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7469v&link_type=abstract
HST Proposal ID #7469
Mathematics
Logic
Hst Proposal Id #7469 Stellar Populations
Scientific paper
We propose to determine the internal velocity distribution of the globular clusters NGC 104 {47 Tuc}, NGC 6752, and NGC 7078 {M15} in their cores and as a function of distance from the cluster center, and thus also infer their mass distribution. NGC 6752 and 47 Tuc are two of the most nearby globular clusters and therefore provide excellent opportunities to derive definitive values {1-2%} comparison of a cluster that fits the classic King profile {47 Tuc} to one in the post-core-collapse stage of evolution {NGC 6752}. M15 is more distant, but is very interesting due to the complex nature of its core. Even at its distance, we expect to determine its velocity dispersion to an accuracy of 3% in the core. We will also derive kinematic distances for the above clusters by comparison to existing radial velocity data. These distances would be good to 1-3% if the radial velocity data were of the expected accuracy of the proper motions. Instead, we will be limited by the radial velocities to 5-10% accuracy, which should still have considerable impact on the derived luminosities of the RR Lyrae stars and their role in the cosmological distance scale. The HST Astrometry Science Team obtained GTO first-epoch exposures of the above clusters and two others {M13 and M22}. In this proposal the HST AST and its collaborators propose to take the second-epoch exposures under GO time for the first three clusters.
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