http://www.pas.rochester.edu/~emamajek/memo_G2V.html WebApr 24, 2016 · So the Gray et al. G2V stars classified using Keenan's standards are basically G4Vs on Houk's system. Remarkably, only 1 of Gray's G2V stars was similarly classified G2V by Houk (HD 25874). The lack of agreement is stunning given that both Houk and Gray et al. explicitly use the Sun as a spectral standard (Houk lists Uranus, Gray …

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A Comparison of B-V Colors of "G2V" Stars - University of Rochester

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