THE NEW DETECTIONS OF {sup 7}Li/{sup 6}Li ISOTOPIC RATIO IN THE INTERSTELLAR MEDIA

Journal Article · Thu Aug 20 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/701/2/1506; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21319543

Kawanomoto, S; Kajino, T; Aoki, W; Ando, H; Noguchi, K; Tanaka, W ^[1]; Bessell, M ^[2]; Suzuki, T K ^[3]; Honda, S ^[4]; Izumiura, H; Kambe, E; Okita, K; Watanabe, E; Yoshida, M ^[5]; Sadakane, K ^[6]; Sato, B ^[7]; Tajitsu, A ^[8]; Takada-Hidai, M ^[9]

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1. National Astronomical Observatory, Mitaka, Tokyo 181-8588 (Japan)
2. Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, 2611 ACT (Australia)
3. Graduate School of Arts and Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153-8902 (Japan)
4. Gunma Astronomical Observatory, 6860-86 Nakayama Takayama-mura, Agatsuma-gun, Gunma 377-0702 (Japan)
5. Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232 (Japan)
6. Astronomical Institute, Osaka-Kyoiku University, Kashiwara-shi, Osaka 582-8582 (Japan)
7. Global Edge Institute Global Edge Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan)
8. Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720 (United States)
9. Liberal Arts Education Center, Tokai University 1117 Kitakaname, Hisatsuka-shi, Kanagawa 259-1292 (Japan)

We have determined the isotopic abundance ratio of {sup 7}Li/{sup 6}Li 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 {zeta} Oph for comparison with previous data. The observed abundance ratios were {sup 7}Li/{sup 6}Li = 8.1{sup +3.6} {sub -1.8} and 6.3{sup +3.0} {sub -1.7} for HD169454 and HD250290, respectively. These values are in reasonable agreement with those observed previously in the solar neighborhood ISMs within {+-}2{sigma} error bars and are also consistent with our measurement of {sup 7}Li/{sup 6}Li = 7.1{sup +2.9} {sub -1.6} for a cloud along the line of sight to {zeta} 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 {sup 7}Li, Galactic cosmic-ray interactions, stellar nucleosynthesis, and big bang nucleosynthesis.

• OSTI ID: 21319543
• Journal Information: Astrophysical Journal, Vol. 701, Issue 2; Other Information: DOI: 10.1088/0004-637X/701/2/1506; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
COSMIC RADIATION
ISOTOPE RATIO
LITHIUM 6
LITHIUM 7
NUCLEOSYNTHESIS
STARS
TELESCOPES