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Updated: May 28, 2025
They include a fairly strong continuous element, a numerous set of absorption-lines, and a range of emission-lines, more or less completely represented in different stars. Especially conspicuous is a broad effluence of azure light, found by Dr. Vogel in 1883, and by Sir William and Lady Huggins in 1890, to be of multiple structure, and hence to vary in its mode of display.
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