NOAO >   Observing Info >   Approved Programs >   2006A-0021

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Proposal Information for 2006A-0021


PI: Katia Cunha, NOAO, kcunha@noao.edu
Address: 950 N Cherry Av., Tucson, AZ 85726, USA

CoI: Verne V. Smith, NOAO
CoI: Steven Majewski, University of Virginia
CoI: Ricardo Munoz, University of Virginia

Title: Mapping Chemical Evolution in the Sagittarius Dwarf Galaxy from Abundances in Red-Giant Stars

Abstract: Elemental abundances derived from high-resolution spectra from individual stars in nearby galaxies can now be used to study chemical evolution in galactic environments that are quite distinct from that of the Milky Way. The Sagittarius dwarf galaxy is particularly interesting because it is in a slow process of merging with the Milky Way and, due to its proximity, provides relatively bright giants as targets. We propose to observe a sample of red-giant members of the Sgr dwarf galaxy in order to study a variety of chemical elements with lines available in the infrared, such as C, N, O, F, Na, Sc, Ti, Fe and Ni. These elements trace different nucleosynthetic processes and will provide insights into the nature of chemical evolution and star formation history in this dwarf galaxy. Of particular interest are the elements O and Na (when measured relative to Fe), which can trace star formation efficiency (via [O/Fe]) and the contributions to chemical evolution from intermediate- mass stars (from [Na/Fe] and [O/Fe]).


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 >   2006A-0021

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