Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..990..169g&link_type=abstract
FIRST STARS III: First Stars II Conference. AIP Conference Proceedings, Volume 990, pp. 169-171 (2008).
Astronomy and Astrophysics
Astronomy
Dwarf Stars, Chemical Analysis, Stellar Atmospheres, Nucleosynthesis, Cosmic Rays
Scientific paper
The stellar abundance of lithium is of great interest in astronomy because of the links with Big Bang nucleosyn-thesis and with processes involving cosmic ray acceleration. High quality Subaru/HDS spectra of the 6707.8 A˚ LiI absorption line were taken for a sample of six metal-poor stars. Here the spectral analysis of only two of the sample stars is presented, BD-04° 3208 ([Fe/H]~-2.21) and BD+26° 3578 ([Fe/H]~-2.25). The results, based on a chi-square analysis, suggest isotopic abundance ratios of 6Li/7Li~0.030 and 0.00. These values agree with the VLT results of [6] within the errors. The confirmation of previous results is a big step forward given the challenging nature of the observations of 6Li. The low value for BD+26° 3578 is in conflict with the reported detection based on McDonald observations. The results have implications for the possible 7Li depletion and in the formation scenarios suggested for 6Li.
Aoki Wako
Elia Garcia Perez Ana
Inoue Susumu
Ryan Sean G.
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