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

S. Inoue, W. Aoki, T. K. Suzuki, S. Kawanomoto, A. E. García-Pérez, S. G. Ryan, M. Chiba

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1 Citation (Scopus)


We discuss the results obtained so far in our ongoing search for the 6Li 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 6Li in the star HD 84937, we achieve a tentative detection in the extremely metal-poor star G 64-12 ([Fe/H] ≃ -3.2). For two other stars with [Fe/H] ≃ -3, only upper limits were derived. Together with the VLT/UVES results of Asplund et al., this indicates unexpectedly high 6Liabundances 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.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalProceedings of the International Astronomical Union
Issue numberC199
Publication statusPublished - 2005


  • Cosmic rays
  • Galaxy: formation
  • Nuclear reactions
  • Nucleosynthesis, abundances
  • Stars: abundances
  • Stars: population II
  • Supernovae: general


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