Present-Day Metallicities for Constructing Star-Formation Histories in Nearby Dwarf Galaxies (South, part 2 of 2)

Details Present-Day Metallicities for Constructing Star-Formation Histories in Nearby Dwarf Galaxies (South, part 2 of 2) Present-Day Metallicities for Constructing Star-Formation Histories in Nearby Dwarf Galaxies (South, part 2 of 2)

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..494l&link_type=abstract

NOAO Proposal ID #2008B-0494

Computer Science

Scientific paper

The largest and most uniform dataset on the histories of star formation will be created with the ACS Nearby Galaxy Survey Treasury (ANGST) program and the Archival of Nearby Galaxies: Reuse, Reduce, Recycle (ANGRRR) programs, which aim, respectively, (1) to secure complete and uniform HST imaging of a volume-limited sample of galaxies out to 3.5 Mpc, and (2) to obtain homogeneous reductions of archival WFPC2/ACS imaging data of galaxies out to a distance of about 5 Mpc. These will provide some of the best and deepest data for the closest galaxies, with derived star-formation rates at ages from tens of Myr to a few Gyr. Without a priori information about metallicities, it can be difficult to disentangle the age-metallicity degeneracy in the construction of color-magnitude diagrams and subsequent comparisons with established isochrone fiducials. Oxygen abundances are easily derived from optical spectroscopy of star-forming regions, and provide present-day metallicity "zero-points" which help break age-metallicity degeneracies. We request a total of 51.5 hr with GMOS at Gemini South to obtain optical long-slit spectroscopic observations of six galaxies in order to derive their present-day metallicity in their interstellar media.

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