Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8291l&link_type=abstract
HST Proposal ID #8291
Physics
Hst Proposal Id #8291 Field Stellar Populations
Scientific paper
We propose STIS observations of A and F supergiants in NGC1569, the closest starburst galaxy. Spectra around 6200 Angstrom taken with the G750M grating will be used to determine element abundances of Fe and several Alpha-elements. The galaxy has experienced a strong starburst over the past few hundred Myr and possibly only very few and much less intense episodes of star formation at earlier epochs. Chemical evolution models predict a significant Alpha/Fe enhancement in the galaxy. This prediction is difficult --- if not impossible--- to verify from an abundance analysis of the gas phase. However, the issue can be settled with a direct abundance measurement in recently formed stars. The proposed STIS observations, in combination with the stellar atmosphere tools we have developed will allow such an abundance determination. These observations are the first abundance measurements of individual stars outside the Local Group. The determination of the Alpha/Fe ratio is fundamen tal to our understanding of the c h emical evolution history of this galaxy. It will also constrain the treatment of mixing processes in the hot and cold phase of the ISM and the enrichment of the intracluster and intergalactic medium. Ultimately, understanding local starbursts in detail will allow us to extrapolate to high redshift and to better understand galaxy evolution in the early universe.
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