Sixteen O and B stars were observed with the Einstein X-ray observatory; X-ray emission from all seven O stars and four of the B stars was discovered. The 0.15-4.5 keV luminosities range from approximately 10 to the 28th to 2 x 10 to the 32nd ergs/s and constitute 10 to the -6th to 10 to the -8th of the total luminosities of the stars detected. Most of the photons emerge at energies less than 1 keV, in contradiction to the prediction made by Cassinelli and Olson (1979) based on a hot corona-cool wind model.
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Long et al. (1980) studied this question.
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