The Early Evolution of Local Group Dwarf Irregular Galaxies

Details The Early Evolution of Local Group Dwarf Irregular Galaxies The Early Evolution of Local Group Dwarf Irregular Galaxies

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6798s&link_type=abstract

HST Proposal ID #6798

Computer Science

Hst Proposal Id #6798 Stellar Populations

Scientific paper

The scientific aim of this proposal is to determine whether gas-containing dwarf irregular galaxies in the Local Group have significant populations of very ancient stars of age comparable to Population II stars in the Galaxy, and if so, whether the properties of these old populations vary with parent galaxy type. A critical diagnostic of a true Population II having both old age {14-16 Gyr} and low metallicity is taken to be the presence of an extended horizontal branch in a color-magnitude diagram. We propose to obtain WFPC2 images in the F555W and F814W bands of two of the nearest Local group dwarf irregulars, WLM and Phoenix, in order to construct color-magnitude diagrams capable of revealing an extended horizontal branch. The CM diagrams will also allow the V-I color distribution of the Population II red giant branch to be determined, from which the mean metallicity and the metallicity dispersion will be derived.

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