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Abundance Analysis for Extremely Metal-Poor Stars from SDSS/SEGUE

Published online by Cambridge University Press:  02 August 2018

T. Matsuno Open the ORCID record for T. Matsuno [Opens in a new window] ,
W. Aoki ,
T. C. Beers ,
Y. S. Lee  and
S. Honda
T. Matsuno
Affiliation:
Department of Astronomical Science, SOKENDAI, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
W. Aoki
Affiliation:
Department of Astronomical Science, SOKENDAI, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
T. C. Beers
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA JINA Center for the Evolution of the Elements
Y. S. Lee
Affiliation:
Department of Astronomy and Space Science, Chungnam National University, Daejeon 34134, Korea
S. Honda
Affiliation:
Nishi-Harima Astronomical Observatory, University of Hyogo, Hyogo 679-5313, Japan
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Abstract

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We report the results of abundance analysis for high-resolution spectra of eight extremely metal-poor turn-off stars selected from SDSS/SEGUE. Based on differential analysis adopting stellar parameters from Balmer line profiles, we obtain the following results: i) Statistically significant scatter is found in [X/Fe] (X=Na, Mg, Cr, Ti, Sr and Ba), among which [Na/Fe] shows an apparent bimodal distribution, ii) Li abundances are ~0.3 dex lower in [Fe/H]<−3.5 than the Spite plateau value without significant scatter.

Keywords

stars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 337 - 338
Copyright
Copyright © International Astronomical Union 2018 

References

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