Investigations representing the departments. Astronomy and astrophysics .. (1903)
University of Chicago · Chicago : The University of Chicago Press · leaf 400
of Sun-spots, physical condition, and probable relationship to solar stars.They should therefore be classed together, as co-ordinate branches leading back to stars like the Sun. 14. Variations in the relative intensities of certain titanium lines indicate that fourth-type starsare probably very… … THREE-PRISM SPECTROGRAPH ATTACHED TO FORTY-INCH REFRACTOR
Astronomy
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