Spectral Classification of Stars Noted on Case Objective-Prism Plates. I

In a recent paper,1 the writer has given spectral types, based on slit spectrograms, of 92 stars that had been noted by Nassau and Morgan as possible Fand early G-type supergiants on objective-prism plates taken at the Warner and Swasey Observatory.2 These objects were found during an inspection of plates that covered a belt 12° wide centered on the galactic equator. In the course of this work, Nassau and Morgan also noted a considerable number of stars that appeared to be supergiants of late G and K type, as well as many others that they suspected of having peculiar spectra. These discoveries were kindly made available by them to the writer, who subsequently obtained slit spectrograms of all of these stars at the Yerkes and Lick Observatories. The present paper gives classifications on the revised Yerkes Atlas system of the great majority of these objects, including, it is believed, all those of high luminosity. The stars have been divided into two groups : Table I contains 58 stars classified as of