THE OPTICAL-SPECTRUM OF THE PLANETARY-NEBULA NGC-2440

Wavelengths and identifications have been provided for approximately 3 00 lines between 3660 and 10125 Angstrom in the spectrum of the bipola r planetary nebula NGC 2440. These lines measured with the Hamilton ec helle spectrograph at Lick Observatory and supplemented by published I UE results are used to construct diagnostic diagrams and derive ionic concentrations. The electron temperature indicated by [O III] is simil ar to 14,200 K: the electron density is similar to 5000 cm(-1). With t he aid of a standard model and an ionization correction factor method, we obtain a set of abundances that are compared with the Sun and with results of previous studies. As with other Peimbert Type I's, He and N are enriched as compared with the Sun; C is likewise overabundant. N GC 2440 evolved from a progenitor star that was more massive than the Sun. The central star temperature seems close to 180,000 K.