Abstract
IUE observations of emission lines in the spectrum of NGC 7662 in the 1150-3300 A range are presented. Combining these observations with optical data obtained by other investigators, the chemical composition for this object is derived. The values obtained are as follows: log C = -3.07, log N = -3.73, log O = -3.09, and log Ne = -3.70. Models of the ionization structure and thermal balance are computed for comparison with the observational data. The values for log O/H and log C/O obtained here are larger than solar values. It is noted that other planetary nebulae have shown a large C/O ratio and that those in the halo have a mean ratio log C/O = 1.1 (Torres-Peimbert, Rayo and Peimbert 1981). The enrichment of the ejected nebula is thought to be showing the effects of the internal evolution of the progenitor star.
