Abundances in the Centaurus A Group Dwarf Irregular Galaxies

Details Abundances in the Centaurus A Group Dwarf Irregular Galaxies Abundances in the Centaurus A Group Dwarf Irregular Galaxies

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..303s&link_type=abstract

NOAO Proposal ID #2002A-0303

Computer Science

Scientific paper

We propose to obtain the chemical abundances of 20 dwarf irregular galaxies (dIs) of the nearby Centaurus A Group. Through H(alpha) CCD imaging (observed in May '99) we have discovered several HII regions in these galaxies, giving us the opportunity to obtain helium, oxygen, nitrogen, neon and sulfur abundances. We expect some of these galaxies to possess some of the most primitive chemical environments known, ideal for studying the early stages of nucleosynthesis in galaxies. These galaxies will serve to test our ability to construct self-consistent star formation histories, i.e., compatible luminosities, colors, total and relative chemical abundances. We have recently completed a comprehensive study of the Sculptor Group dIs, and the proposed survey will allow us to make a comparative study. The Centaurus A Group is a structurally denser group, and its dIs have, on average, much higher star formation rates than the dIs in the Local Group or the Sculptor group. This allows us to study the influence of environment on dwarf galaxy evolution. By giving the lowest luminosity systems highest priority, we will complement the comprehensive study of dI properties conducted by van Zee and test the hypothesis that all of the lowest metallicity dwarfs are young galaxies.

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