W. J. Maciel -
Abstract #43
CHEMICAL ABUNDANCES OF DISK PLANETARY NEBULAE
J. A. Freitas Pacheco, W. J. Maciel, R. D. D. Costa
Astron. Astrophys. 261, 579-588 (1992) New determinations of chemical abundances of disk planetary nebulae in the southern hemisphere are reported. Most objects belong to Type II according to the classification scheme proposed by Peimbert. We present line fluxes, colour excesses, electron temperatures and densities, and abundances of He, N, O, Ne, S, and Ar for 33 nebulae, several of which for the first time. Distance-independent corrrelations are used to classify these objects according to the population types within the subsystem of planetary nebulae.
