CHEMICAL-COMPOSITION OF THE SHELL OF NOVA V1974-CYGNI

The CCD spectra of Nova Cygni 1992 = V1974 Cyg in the nebular phase ob tained between May 1992 and October 1993 at the Crimean Station of the Sternberg Astronomical Institute and in Moscow are used to determine the chemical composition of its shell. The chemical composition of the shell confirms that Nova V1974 Cyg belongs to the class of ONeMg nova e. The difference in the neon abundances derived by us and by Rafanell i et al. (1995) is discussed. The results can be reconciled by assumin g that the electron temperature in the Ne3+ emission region is 5000-10 000 K higher than that in the Ne2+ region. In addition to He, O, and N , we determined the abundances of Ar, Fe, C, and Cl.