Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-13T09:27:48.368Z Has data issue: false hasContentIssue false
  • English
  • Français

Near-IR Spectroscopy of CEMP Stars with SOAR/OSIRIS

Published online by Cambridge University Press:  09 March 2010

Catherine R. Kennedy ,
Thirupathi Sivarani ,
Timothy C. Beers ,
Silvia Rossi ,
Vinicius M. Placco ,
J. Johnson  and
T. Masseron
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
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Keywords

stars: abundancesstars: carbonGalaxy: halosurveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 126 - 127
Copyright
Copyright © International Astronomical Union 2010

References

Aoki, W., Beers, T. C., Christlieb, N., Norris, J. E., Ryan, S. G., & Tsangarides, S. 2007, ApJ, 655, 492CrossRefGoogle Scholar
Beers, T. C. & Christlieb, N. 2005, ARA&A, 43, 531Google Scholar
Beers, T. C., Sivarani, T., Marsteller, B., Lee, Y. S., Rossi, S., & Plez, B. 2007, AJ, 133, 1193CrossRefGoogle Scholar
Hirschi, R., Fröhlich, C., Liebendörfer, M., & Thielemann, F.-K. 2006, RvMA, 19, 101Google Scholar
Meynet, G., Ekström, S., & Maeder, A. 2006, A&A, 447, 623Google Scholar