ON PLANETARY-NEBULA NUCLEI OF THE SPECTRAL TYPE CONTINUOUS

A detailed reexamination of existing and new IUE low- and high-resolut ion spectra, plus a search of recent literature, shows that for most o f the central stars of planetary nebulae the spectral classification p reviously called ''continuous-type'' does not really exist. The stella r continua show primarily photospheric absorption features of N V, O V , C IV, H, He II, Fe VII, Fe VI, and Fe V, and/or P Cygni profiles.