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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8655k&link_type=abstract
HST Proposal ID #8655
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Hst Proposal Id #8655 Stellar Populations
Scientific paper
This is a proposal to establish a globular-cluster distance scale of unprecedented accuracy and reliability, with far- reaching impact on the distance and time scales of cosmology. Our method is to compare internal dispersions of proper motion with ground-based determinations of the dispersion of radial velocities. The prospect is a geometrically based distance scale with an accuracy of better than 2 ability to make such measurements, and we are progressing with the conversion of them to a distance for the cluster. Our project has two parts: {1} Where possible, we use archival observations for both astrometric epochs {see accompanying AR proposal, which covers 2 clusters}. {2} The present proposal covers 5 more clusters for which an archival first epoch exists but for which we lack second-epoch observations. With this proposal, the accompanying AR proposal, and other HST collaborations in which we are involved, we expect to determine accurate distances for 13 clusters, with a large range of metallicities and second-parameter characteristics. {Moreover, we intend to cover additional clusters in future ACS proposals.}
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