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A Re-Evaluation of the Abundance of Lutetium in the Sun

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Abstract

Lutetium is one of the few nonvolatile elements whose solar photospheric abundance departs significantly from that derived from CI chondrites. We have applied the Cowan code to compute new oscillator strengths for Luii, and have included a correction for core polarization. The results have been used in a synthesis of the solar spectrum in the vicinity of features at \(\lambda _ \odot \)3397.062 and\(\lambda _ \odot \)6221.72. We find that the majority of the absorption in the ultraviolet feature is due to NH, making it unsuitable for extracting a reliable lutetium abundance. Our best fit to the low-noise Jungfraujoch spectrum for the weak, nine-component hyperfine Luii line at λ 6221.87 yields an abundance of +0.06 on a scale where log(H) = 12.00. This value is within 0.07 dex of the meteoritic result (+0.13). (These figures reflect the note added in proof below.)

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Authors and Affiliations

  1. Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI, 48128, U.S.A.

    D. J. Bord & D. Mirijanian

  2. Department of Astronomy, University of Michigan, Ann Arbor, MI, 48109, U.S.A.

    C. R. Cowley

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  1. D. J. Bord
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  2. C. R. Cowley
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  3. D. Mirijanian
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Bord, D.J., Cowley, C.R. & Mirijanian, D. A Re-Evaluation of the Abundance of Lutetium in the Sun. Solar Physics 178, 221–237 (1998). https://doi.org/10.1023/A:1004901023385

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