Variable Stars

able absorption amplitude appear associated average bright lines Cepheids changes Chapter cluster color component considered contains continuous Contr Coronae Borealis definite derived determined discussed distribution eclipsing stars effect evidence example faint fall follows frequency galactic give given greater Harvard important included indicate intensity intervals irregular km/sec less light curve Little known long-period variables Longp magnitude Majoris mass maximum mean measured Merrill method minima Miss nebula nebulosity noted novae objects observed period period variables photographic photographic magnitude plates possible present probably properties radial velocity range ratio Reference relation relative rise Sequence shown similar spectra spectroscopic spectrum suggested Table temperature tion values vari variable stars variation visual