The Stars of High Luminosity

abnormally absolute magnitude absorption O stars Adams and Russell bright lines brighter c-character c-stars calcium Cepheid variables Chapter XIV cluster type variables color Contr Cygni discussed dispersion dwarf Effective Atoms fainter G band galactic clusters Gerasimovič giant helium high luminosity stars hydrogen lines intensities ionization K line light curves line depth Lines appear narrow Lines narrow Lines Lines probably narrow Lines somewhat narrow Lines very narrow long period variables luminous maximum Mean Percentage Light measured Messier Miss Cannon Mount Wilson narrow Lines narrow nebulae normal stars novae number of stars numbers of atoms Numbers of Effective observed Percentage Light Losses period-luminosity curve pressure radial velocity range Shapley and Miss spectral class spectral sequence spectroscopic binary spectrum stars of Class summarized supergiant surface gravity Table XV theory total absorption variable stars variation visual magnitude Wolf-Rayet stars Ηβ Ηδ