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    Naturevolume 74page595 (1906) | Download Citation



    THE RELATION BETWEEN THE SPECTRA OF SUN-SPOTS AND STARS—The conclusion arrived at by Sir Norman Lockyer regarding the similarity of the spectra of sun-spots and Arcturian stars (Proc. Roy. Soc., vol. lxxiv., 1904) receives confirmation from a research carried out at the Mount Wilson Observatory. The results of this research are published by Mr. W. S. Adams in No. 2, vol. xxiv., of the Astrophysical Journal. During the latter part of June some spectrograms of sun-spots were obtained, including the blue end of the spectrum, and these were compared with a spectrogram of Arcturus secured with the Snow telescope and a grating spectroscope, with a total exposure of twenty-three hours. The comparison showed that

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