NOAO >   Observing Info >   Approved Programs >   2010A-0316

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Proposal Information for 2010A-0316


PI: Kris Sellgren, Ohio State University, sellgren@astronomy.ohio-state.edu
Address: Astronomy Department, 140 West 18th Av., Columbus, OH 43210, USA

CoI: Katia Cunha, NOAO
CoI: Robert Blum, NOAO
CoI: Solange Ramirez, NExScI/IPAC/Caltech
CoI: Verne Smith, NOAO

Title: Stellar Abundances within 2 pc of the Central Black Hole in the Galactic Center

Abstract: 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.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0316

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