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Subaru/HDS Studies of r-Process Elements in Metal-Poor Stars from Near-UV Spectra

Published online by Cambridge University Press:  23 December 2005

S. Honda ,
W. Aoki ,
Y. Ishimaru ,
S. Wanajo ,
S. G. Ryan ,
T. Kajino ,
H. Ando  and
T. C. Beers
S. Honda
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: honda@optik.mtk.nao.ac.jp
W. Aoki
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: honda@optik.mtk.nao.ac.jp
Y. Ishimaru
Affiliation:
Department of General Education, Kogakuin University, 2665-1 Nakano-Cho, Hachioji, Tokyo 192-0015, Japan
S. Wanajo
Affiliation:
Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
S. G. Ryan
Affiliation:
Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes MK76AA, UK
T. Kajino
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: honda@optik.mtk.nao.ac.jp
H. Ando
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan email: honda@optik.mtk.nao.ac.jp
T. C. Beers
Affiliation:
Department of Physics and Astronomy and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA.
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Abstract

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We present detailed abundance measurements of neutron-capture elements for the two very metal-poor stars HD 6268 and HD 122563, based on very high-quality, near-UV spectra (S/N >140 @3100A) using Subaru/HDS. Abundances have been obtained for a total of 26 and 19 neutron-capture elements in these two stars, respectively, including Nb, Mo, Ru, Pd, Ag, Pr, and Sm. We have confirmed that the abundance pattern of neutron-capture elements in HD 6268 agrees very well with that of previously known r-process-enhanced stars. In contrast, the elemental abundances of HD 122563 are found to steeply decrease with increasing atomic number than those of HD 6268, and are much lower than than the r-process pattern in solar-system material. This result provides a new, strong constraint on models of the nucleosynthetic process that has provided light neutron-capture elements in the very early Galaxy.

Keywords

Stars: abundancesultraviolet: starsnuclear reactionsnucleosynthesisabundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 429 - 434
Copyright
© 2005 International Astronomical Union