Abstract
The [SI] lines are due to transitions within the 3s23p4 ground configuration of neutral sulphur. The results are presented from a search for the [Si] lines in the Fraunhofer spectrum. Two identifications are proposed with faint features in the Fraunhofer spectrum: 1D2-1S0 at λ ⊙ = 7725.02 Å and 3P2-1D2 at λ ⊙ = 10821.23 Å. Their measured equivalent widths are shown to confirm the value for the solar abundance of sulphur, logN S = 7.21 (in the scale logN H = 12.00), which is derived from the permitted high-excitation lines. These lines give the first convincing identification of [Si] lines in an astrophysical source.
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Swings, J.P., Lambert, D.L. & Grevesse, N. Forbidden sulphur I lines in the solar spectrum. Sol Phys 6, 3–11 (1969). https://doi.org/10.1007/BF00146788
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DOI: https://doi.org/10.1007/BF00146788