GALACTIC B-SUPERGIANTS .1. AN ATLAS OF O9-B9 SUPERGIANT SPECTRA FROM 3950-A TO 4950-A

CCD spectra are presented for supergiants of spectral types O9-B9 and luminosity subclasses Ia and Ib. They cover the wavelength region from approximately 3950 angstrom to 4950 angstrom at a resolution of 0.8 angstrom, and normally have a signal-to-noise in excess of 150 at 4600 angstrom. The spectra are discussed in respect to their classification. A number of stars show clear evidence of the 'filling in' of hydrogen lines by emission from the stellar wind while HD 190603, a B1.5 Ia+ hypergiant, exhibits a H-beta P-Cygni type line-profile. We also report the finding of a new nitrogen weak star, HD 13866, in the Per OB1 association which is classified here as BC2 Ib.