Abstract
WATER-VAPOUR LINES IN THE SUN-SPOT SPECTRUM.—In a paper read before the Dublin meeting of the British Association, and again in No. 5, vol. xxviii., of the Astro-physical Journal, Father Cortie directed attention to certain water-vapour lines in the solar spectrum which appear to become intensified in the spot spectrum. Examining ninety-one lines in the region D1 to λ 5953.386, sixty-four, or 70.3 per cent., of which are due to water vapour, he found that of the sixty-four, twenty-nine, or 45 per cent., are affected in the spectrum of the spot either as widened or darkened lines. An examination of Hale's map showed that sixteen of these twenty-nine lines were also shown there as widened or darkened.
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Our Astronomical Column . Nature 79, 438–439 (1909). https://doi.org/10.1038/079438a0
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DOI: https://doi.org/10.1038/079438a0