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b-type variables blue mean density blue plate pairs bolometric correction bolometric intensity Centauri characteristic curve cluster was set color index comparison stars lying computed with Greenstein's const corresponding mean curve was drawn dmg/dPh Dº's four red plate four special plates given in Greenstein's given in Table Greenstein's light curves Greenstein's period Greenstein's Table Hence individual field corrections last equation least squares solution magnitude difference magnitudes and colors main plates mean colors mean density system mean magnitudes measured mº's mºb mobs mºna's mºol mºr obtain optical axis period changes period-density law period-density relation photographic magnitude plotted preliminary phase shifts preliminary value pulsating quadrant for stars red mean density red plate pairs red system reduced residuals rt rt second repetition Shapley's smooth curve spectral types T A B L E taken from Greenstein's zero point