The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 214
ASTRONOMY. 193 191. Sun-Spot Spectrum. — When the image of a sun-spotis thrown upon the slit of the spectroscope, the spectrum isseen to be crossed longitudinally by a continuous dark band,showing an increased general absorption in the region of thesun-spot. Many of the spectral lines are greatly… … shown in Fig. 2to. This thickening of the lines shows thatthe absorption is taking place at a greater depth. New linesand shadings often appear, which indicate, that, in the coolernucleus of the spot, certain compound vapors exist, which are
Astronomy
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