Some Spectroscopic Characteristics of the OB Stars: a Nitrogen Anomaly

During a spectroscopic investigation of the OB stars with a dispersion of 63 A 1, a number of stars have been found in which the nitrogen lines are too strong or too weak for their spectral types. A striking case of a spectrum with N in enhanced, HD 201345, is illustrated and discussed, and other examples of this new class of peculiar OB stars are listed.