Publications of the Astronomical Observatory, University of Minnesota, Volume 3, Issue 7University of Minnesota Press, 1952 - Astronomy |
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1940 he finally absolute magnitude accurate and homogeneous appears to antedate bulk of white Cassegrain focus color index color survey conducted diagram noticeably different dwarf than spectral dwarfs are fainter dwarfs known dwarfs which form easiest stars eral lists fifth column gathered on white go fainter hardest to observe Hertzsprung-Russell diagram homogeneous color indices Hyades indicator of luminosity Kapteyn's star known that Kapteyn's Kuiper disagreed Kuiper has published large number literature until 1923 M-type subdwarf definitely main sequence main-sequence matter of parallaxes McDonald and Mount McDonald Observatory Mount Wilson Observatories normal red dwarf observations on white Observatory were obtained once the easiest Otto Struve parallaxes the prospect Paul D proper motion provement in photoelectric published sev regular white dwarfs remarks about intermediates scopic observations sequence as Arcturus show helium lines spectra are indicated spectral class spectrograph stars to identify subdwarf definitely established terminology intermediate thousand possible stars writer is further