Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...701.1506k&link_type=abstract
The Astrophysical Journal, Volume 701, Issue 2, pp. 1506-1518 (2009).
Astronomy and Astrophysics
Astronomy
5
Ism: General, Stars: Individual: Hd169454 Hd250290 Ζ Oph
Scientific paper
We have determined the isotopic abundance ratio of 7Li/6Li in the interstellar media (ISMs) along lines of sight to HD169454 and HD250290 using the High-Dispersion Spectrograph on the Subaru Telescope. We also observed ζ Oph for comparison with previous data. The observed abundance ratios were 7Li/6Li = 8.1+3.6 -1.8 and 6.3+3.0 -1.7 for HD169454 and HD250290, respectively. These values are in reasonable agreement with those observed previously in the solar neighborhood ISMs within ±2σ error bars and are also consistent with our measurement of 7Li/6Li = 7.1+2.9 -1.6 for a cloud along the line of sight to ζ Oph. This is good evidence for homogeneous mixing and instantaneous recycling of the gas component in the Galactic disk. We also discuss several source compositions of 7Li, Galactic cosmic-ray interactions, stellar nucleosynthesis, and big bang nucleosynthesis.
Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Ando Hiroki
Aoki Wako
Bessell Michael
Honda Satoru
Izumiura Hideyuki
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