Computer Science
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..230j&link_type=abstract
NOAO Proposal ID #2009A-0230
Computer Science
Scientific paper
The Galactic globular cluster Omega Centauri (ω Cen) exhibits a huge metallicity spread spanning - 2.2⪉[Fe/H]⪉-0.6 that is contained in multiple, distinct stellar populations. ω Cen's large chemical heterogeneity extends to all elements, suggesting the cluster experienced self-enrichment on a scale not seen in ``normal" globular clusters. By comparing the evolution of light and heavy elements, which have different production sources and timescales, it is possible to reconstruct the cluster's chemical history. Large, homogeneous samples are required to avoid selection and evolutionary biases and to accurately follow the chemical evolution with metallicity. Therefore, we propose to obtain Hydra spectra containing O, Na, (alpha), and Fe-peak abundances in a 100% complete sample down to V=13.5 by adding the remaining 360 red giant branch stars to our current sample containing ~70% of the bright giants. We also propose to obtain ~300 additional Hydra spectra that include Al, La (s-process), and Eu (r-process) lines to supplement our sample of 80 spectra in this region. These data will compliment a similar dataset of Galactic bulge giants.
Fulbright Jon
Johnson Christian
Pilachowski Catherine
Rich Michael
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