Computer Science – Learning
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..225i&link_type=abstract
NOAO Proposal ID #1999B-0225
Computer Science
Learning
Scientific paper
We propose to carry out a comprehensive chemical abundance study of metal-poor stars, selected on the basis of their space motions as members of the Galactic thick disk and halo. The results will permit us to place constraints on both the supernova progenitors as well as the star formation history in the different stellar components which were present in the early epochs of the Galaxy. Trends of relative chemical abundances of important elements (e.g., tracers of massive star evolution as well as of supernova types I and II) as functions of both metal abundance and stellar birthplace are required in order to understand the rate and duration of different nucleosynthesis sites. Previous studies have been hampered either by small number statistics, or have been forced to use samples which were not kinematically well defined. New space motion information now makes it feasible to conduct a comprehensive chemical abundance survey of well-specified kinematically selected stars. In addition to learning which scenario, among several plausible alternatives, best describes our own Galaxy's formation history, we hope to identify similar signatures in composite spectra of other galaxies.
Beers Timothy
Ivans Inese
Sneden Chris
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