The interstellar Li-7/Li-6 isotope ratio toward Zeta Ophiuchi and Zeta Persei

Details The interstellar Li-7/Li-6 isotope ratio toward Zeta Ophiuchi and Zeta Persei The interstellar Li-7/Li-6 isotope ratio toward Zeta Ophiuchi and Zeta Persei

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409l..61m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 409, no. 2, p. L61-L64.

Astronomy and Astrophysics

Astrophysics

35

Absorption Spectra, Abundance, Galactic Evolution, Interstellar Matter, Line Spectra, Lithium, B Stars, Charge Coupled Devices

Scientific paper

High S/N, high-resolution observations of the interstellar Li absorption lines toward the stars Zeta Ophiuchi and Zeta Persei are reported. Li I line profiles indicate the presence of both the Li-7 and Li-6 doublets in these two sightlines. Best-fit values for the interstellar Li-7/Li-6 isotope ratio are 6.8 (+1.4/-1.7) towards Zeta Ophiuchi and 5.5 (+ 1.3/-1.1) toward Zeta Persei. Measurement of 6.8 (+1.4/-1.7) for the interstellar Li-7/Li-6 isotope ratio towards Zeta Ophiuchi does not support the lower limit of 25 determined by Ferlet and Dennefeld (1984). The current value of the interstellar Li-7/Li-6 isotope ratio is the result of various lithium production and destruction processes involving stars, cosmic rays, and the big bang.

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