Abstract
The variability of the B–G supergiants is studied here with a set of 500 observations made for 76 stars. In addition to the discussion on the variability in colour indices (Maeder and Rufener, 1972), we also include the analysis of the apparent magnitudes. The observations, made randomly in time over several years, are selected from the new Catalogue (Rufener, 1974) of stars measured in the Geneva Observatory system. Some results on the luminosity dependence of the variations are presented in Table I.
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