Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop...21c&link_type=abstract
NOAO Proposal ID #2006A-0021
Physics
Scientific paper
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]).
Cunha Katia
Majewski Steven
Munoz Ricardo
Smith Verne V.
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