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A SURVEY OF THE CENTRAL-STAR CHARACTERISTICS OF MOSTLY FAINT PLANETARY NEBULAE.

From a survey of 70 planetary nebulae whose spectra have been studied with the image-tube scanner (ITS) at the Shane 3-m telescope of Lick Observatory, the authors assess the characteristics of the central stars. About two dozen appear to have central stars with continuous spectra; a slightly large number is classified as weak-emission-line objects with N III, C III, and C IV lines; seven are of the Wolf-Rayet type. Most of the observed objects lie in the direction of the galactic bulge; the others were scattered in galactic longitude to the anticenter. There appears to be no evidence for a systematic concentration of the types with respect to galactic longitude.