The Globular Clusters in the Fornax Dwarf Galaxy-Physical Parameters and Chronology

Details The Globular Clusters in the Fornax Dwarf Galaxy-Physical Parameters and Chronology The Globular Clusters in the Fornax Dwarf Galaxy-Physical Parameters and Chronology

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5917z&link_type=abstract

HST Proposal ID #5917

Computer Science

Hst Proposal Id #5917 Stellar Populations

Scientific paper

From photometry of the four most metal-poor globular clusters in the Fornax Dwarf Spheroidal Galaxy with the WFPC2, we will: (1) measure their ages, (2) study their populations of blue stragglers, (3) measure their horizontal branch (HB) morphologies, (4) measure their He and metal abundances Fe/H, and (5) their radial density profiles. The HST is required because only it has the resolution and faint limiting magnitude necessary to reach the main- sequence turnoffs in the central regions of the clusters, where cluster stars greatly out number field stars. Our results for (1) will indicate the duration of metal-poor cluster formation in this very low-mass galaxy and test the relationship between cluster age and HB morphology. (4) will provide the first estimate of He abundance in this galaxy. (2, 3, 4, 5) will reveal how the Fornax globulars compare with ones in the Milky Way in terms of their stellar populations and structures. A comparison of the apparent magnitudes of their HB's will test predictions of the HB luminosity-Fe/H relationship. Our results will provide valuable information on the evolution of globular clusters and low-mass galaxies. This proposal is a updated version of one which recieved time in Cycle 1 (had to be deferred) and supplemental time in Cycle 4.

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