Computer Science
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..316s&link_type=abstract
NOAO Proposal ID #2010A-0316
Computer Science
Scientific paper
The chemical abundances of young, massive, cool stars in the central few pc of the Milky Way trace star formation and chemical enrichment histories in a unique Galactic environment in close proximity to a massive black hole. Our Galactic Center is of intense interest for understanding the nuclei of both normal galaxies and AGNs. We propose to follow up the unexpected discovery of enhanced alpha-element stellar abundances at near-solar metallicity in the Galactic Center. Our initial study focused on the alpha-elements O and Ca in 10 stars; we have recently doubled our sample size by observing two key elements, Mg and Al. The distinct behaviors of O and Mg as a function of metallicity trace the relative importance of Wolf-Rayet winds in shaping the nature of chemical evolution, while the supernova yields of Al are metallicity dependent. We propose here to complement our recent observations by measuring Fe, Ca, and O in this larger sample of stars. Taken together, the combination of O, Mg, Ca, Al and Fe abundances will allow modeling of the chemical evolution within a unique region of the Milky Way.
Blum Robert
Cunha Katia
Ramirez Solange S.
Sellgren Kris
Smith Verne
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