Abstract
IN a recent paper, Waddell and Slaughter1 suggested that the composite feature at 8668.43 Å in the solar spectrum includes a high excitation line of B I. This line is one of a number first reported in the laboratory spectrum of B I by Gunnvald and Minnhagen2 (Table 1). From the observed central depth of 0.015, a boron: hydrogen ratio of 4.0 × 10−7 was deduced. The terrestrial ratio3 is 7.6 × 10−10, while Russell's4 photospheric upper limit is 1.1 × 10−7. This figure was later reduced by Babcock5 to 2.8 × 10−8.
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References
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LAMBERT, D., MALLIA, E. & WARNER, B. Abundance of Boron in the Sun. Nature 211, 56–57 (1966). https://doi.org/10.1038/211056a0
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DOI: https://doi.org/10.1038/211056a0
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