Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12304h&link_type=abstract
HST Proposal ID #12304. Cycle 18
Physics
Scientific paper
We will measure metallicity distribution functions {MDFs} in four Local Group dwarf galaxies {Leo I, Leo II, Phoenix, and IC 1613} using a new medium band filter available with WFC3 that covers the Ca H and K lines - the strongest metal absorption lines in the visible spectrum of cooler stars. In addition to the Ca filter {F390M}, we will obtain broadband observations in several optical and near-IR filters. Together, these will yield metallicity measurements with an accuracy of about 0.2 dex for giants brighter than the red clump. Unlike broadband colors, our multiband metallicity measurements will be insensitive to age variations in the population and reddening uncertainties or variations. The photometric metallicities will allow us to construct MDFs with almost an order of magnitude more stars than has been obtained from the ground for Leo I and Leo II, and hence will provide more stringent constraints on the number of rarer, more metal-poor stars; these will provide the first measurements of the metallicity distribution function in Phoenix and IC1613. The four galaxies span a wide range of different star formation histories. The MDFs will constrain models of chemical evolution and improve the derivation of the star formation histories.;
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