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Published online by Cambridge University Press: 14 August 2015
The superluminous B supergiants are loosing mass and their progenitors are supposed to be O stars between 03 and 06 and hence it is justified to talk about B1Ia-O supergiants in this Symposium. Extensive high dispersion spectroscopic observations of four luminous B1 supergiants of the southern hemisphere have been carried out during 1972 and 1975 at ESO, La Silla. Some characteristic data of the program stars are summarized in Table 1.