Computer Science
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..392b&link_type=abstract
NOAO Proposal ID #2007A-0392
Computer Science
Scientific paper
We propose to carry out moderate resolution near-IR spectroscopy of a sample of 50 Carbon-Enhanced Metal-Poor (CEMP) stars in order to measure their O content and ^12C/^13C ratios, and thereby constrain the nucleosynthetic histories of these stars. From previous studies, two primary categories of CEMP stars have emerged: those with enhanced neutron-capture elements (CEMP-s, CEMP-r, and CEMP-r/s), and those that do not show strong enhancements of neutron-capture elements (CEMP-no). While the atmospheres of CEMP-s stars have likely been polluted by intermediate-mass AGB companions, the source of the observed abundance patterns of the CEMP-no stars is not readily explained. Theoretical work suggests that the CEMP-no stars may have formed from material that had been enriched via mass-loss by massive, rapidly rotating, mega metal-poor ([Fe/H] < -6.0) stars; however, existing samples of CEMP-no stars with available CNO measurements are too small to fully explore this connection. We hope to significantly expand the database of O abundances and the valuable ^12C/^13C ratio - key tracers of both massive star and AGB nucleosynthesis - for CEMP-no and CEMP-s stars with the proposed observations and as a result, dramatically increase our understanding of nucleosynthesis in the early Galaxy.
Beers Timothy C.
Marsteller Brian
Rossi Silvia
Schuler Simon C.
Sivarani Thirupathi
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