Expanding Atmospheres in OB Supergiants--IV: A Mass-Loss Survey

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Abstract
A study of medium-dispersion spectra of seven very bright early-type stars has indicated the presence, to a varying degree, of expansion in the outer layers of their envelopes. A brief survey of other early-type supergiants has indicated that a similar situation arises in eleven of them. Combined with the results of detailed studies of four stars with large mass loss, these conclusions indicate that mass loss is common among the brightest hot stars. The rate of mass loss increases with luminosity and effective temperature amongst the OB stars and may well be an important consideration in the evolution of massive stars.

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