Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341601k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #416.01; Bulletin of the American Astronomical Society, Vol. 41, p.226
Astronomy and Astrophysics
Astrophysics
Scientific paper
We report on medium-resolution near-IR spectroscopy of a sample of over 70 Carbon-Enhanced Metal-Poor (CEMP) stars observed with SOAR/OSIRIS, selected from the HK survey of Beers and colleagues and the Hamburg/ESO Survey of Christlieb and colleagues. Oxygen abundances from the molecular CO lines as well as 12C/13C ratios are estimated from the near-IR spectra of these stars. Near-IR model spectra with varying oxygen abundances, in combination with previously determined parameters from optical spectra, are used for the estimation of abundances for this sample. There are two categories of CEMP stars: those with neutron-capture enhancement (CEMP-s, CEMP-r, CEMP-r/s), and those without (CEMP-no). Abundance patterns of those stars with neutron-capture enhancement are posited to be the result of mass transer from AGB companion stars. The origin of the abundance patterns in CEMP-no stars is less certain. Proposed models include low-metallicity AGB mass-transfer (in which the s-process is supressed), mass loss by rapidly rotating mega metal-poor stars ([Fe/H]< -6.0), or pollution by early supernovae. As both oxygen abundances and 12C/13C ratios are tracers of nucleosynthesis, we hope to gain information about Galactic nucleosynthesis through the analysis of this sample.
This work was supported in part by grants PHY 02-16783 and PHY 08-22648: Physics Frontiers Center / Joint Institute for Nuclear Astrophysics (JINA), awarded by the U.S. National Science Foundation.
Beers Timothy
Johnson Jesse
Kennedy Catherine R.
Masseron Thomas
Placco V.
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