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$^6$Li in very metal-poor halo stars observed by Subaru/HDS and implications

Published online by Cambridge University Press:  23 December 2005

S. Inoue ,
W. Aoki ,
T.K. Suzuki ,
S. Kawanomoto ,
A.E. García-Pérez ,
S.G. Ryan  and
M. Chiba
S. Inoue
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan email: [email protected] Max-Planck-Institut für Kernphysik, Heidelberg, Germany
W. Aoki
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan email: [email protected]
T.K. Suzuki
Affiliation:
Kyoto University, Sakyo-ku, Kyoto, Japan
S. Kawanomoto
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan email: [email protected]
A.E. García-Pérez
Affiliation:
The Open University, Milton Keynes, UK
S.G. Ryan
Affiliation:
The Open University, Milton Keynes, UK
M. Chiba
Affiliation:
Tohoku University, Aoba-ku, Sendai, Japan
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Abstract

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We discuss the results obtained so far in our ongoing search for the $^6$Li isotope in very metal-poor halo stars through very high resolution and S/N spectroscopy with the Subaru High Dispersion Spectrograph, and the consequent implications. Besides definitively confirming the existence of $^6$Li in the star HD 84937, we achieve a tentative detection in the extremely metal-poor star G 64-12 ([Fe/H]$\,{\simeq}\,{-}$3.2). For two other stars with [Fe/H] ${\sim}\,{-}3$, only upper limits were derived. Together with the VLT/UVES results of Asplund et al., this indicates unexpectedly high $^6$Li abundances in at least some stars at very low [Fe/H]. The findings are discussed in light of different production scenarios, including the structure formation cosmic ray model and other possibilities.

Keywords

Stars: abundancesstars: Population IIcosmic raysnuclear reactionsnucleosynthesisabundancesGalaxy: formationsupernovae: general
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. 59 - 64
Copyright
© 2005 International Astronomical Union