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Geneva intrinsic colours of the supergiants of spectral types A and F The aim of this research note is to expose a photometric method todetermine the intrinsic values of the Geneva color index (B2-V1) for thesupergiants of spectral types A and F. The different stages which led tothis objective are presented, and the method is tested with a few starsbelonging to clusters for which color excesses were found in theliterature. A list of stars classified as supergiants which behavephotometrically as dwarfs is indicated.
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