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Near-IR Spectroscopy of CEMP Stars with SOAR/OSIRIS

Published online by Cambridge University Press:  09 March 2010

Catherine R. Kennedy
Affiliation:
Department of Physics & Astronomy and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824 email: kenne257@msu.edu
Thirupathi Sivarani
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
Timothy C. Beers
Affiliation:
Department of Physics & Astronomy and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824 email: kenne257@msu.edu
Silvia Rossi
Affiliation:
IAG, University of São Paulo, Brazil
Vinicius M. Placco
Affiliation:
IAG, University of São Paulo, Brazil
J. Johnson
Affiliation:
Department of Astronomy, Ohio State University, Columbus, OH
T. Masseron
Affiliation:
Department of Astronomy, Ohio State University, Columbus, OH
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Abstract

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We report on medium-resolution near-IR spectroscopy of a sample of over 60 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 rough estimates of 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. 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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

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