The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific (1919)
Astronomical Society of the Pacific, Aitken, Robert Grant, 1864-1951 · San Francisco Stanford University Press · leaf 355
he more luminous objects being the redder. Determinations of the exposure ratio for a group of giantand dwarf stars illustrate the nature of the dependence. The 234 The Adolfo Stahl Lectures results are illustrated in Fig. 20, in which vertical distancesrepresent the logarithm of the exposure… … Fig. 20. Variation of Color With Spectrum for Giant (HeavyLine) and Dwarf (Light Line) Stars. Vertical distances representlogarithms of the ratio of exposure for blue light to exposure foryellow light necessary to produce the same photographic effect. Forstars having G and K spectra the giants are…
Astronomy
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