Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop...99s&link_type=abstract
NOAO Proposal ID #2009B-0099
Astronomy and Astrophysics
Astrophysics
Scientific paper
Carbon-Enhanced Metal-Poor (CEMP) stars make up a large fraction of very metal-poor (VMP) stars in the Galactic halo, and they are proving to be important to our understanding of a wide range of astrophysical phenomena. Accurate abundance determinations of these stars are needed to both fully delineate their formation and evolution, and to firmly place them into a greater astrophysical context. Our group has recently demonstrated that CEMP star C abundances derived from the blue bands of CH and the C_2 Swan system, the principal features used for this purpose, may be systematically overestimated at [Fe/H] <=- 3.0. We have also shown that the (lambda) 8727 forbidden [C I] line is an accurate abundance indicator for CEMP stars. Here we propose an observational program to obtain Keck/HIRES spectra of six CEMP stars, four of which have Fe abundances ranging from -4.0 <=[Fe/H] <=-3.12, in order to derive accurate C abundances of the targets from the [C I] line. With the proposed observations we will determine if indeed molecular line-based C abundances of CEMP stars are too high at very low metallicities and if so, provide empirically determined corrections for those abundances.
Asplund Martin
Beers Timothy C.
Cunha Katia
Margheim Steven J.
Schuler Simon C.
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