Carbon, Nitrogen, and Oxygen Abundances in Early B-Type Stars

We report on a survey of the C, N, and O abundances in a sample of early B-type stars which was undertaken to test Lyubimkov's claim that CN-cycled material is mixed to the surfaces of these stars during their core hydrogen-burning phase. We have obtained equivalent widths of generally weak lines using high signal-to-noise Reticon spectra of 39 stars in four spectral regions. We have derived effective temperatures and gravities for these stars using Stromgren dereddened color indices and Hy line profiles through a comparison with colors and line profiles from Kurucz line-blanketed atmospheres