Abstract
ABSTRACT The variations of CNO abundances in planetary nebulae showing significant nucleosynthesis effects are studied. The group of PN include 17 Galactic Type I, 4 halo, 6 SMC, and 6 LMC objects for which accurate C and N abunances were determined based on ultraviolet lines observed with the IUE satellite, coupled with extensive ground-based spectrophotometry for detailed diagnostics of physical conditions. Correlations between C, N, O, and He are studied using a variety of diagrams. The results suggest that C + N is approximately constant in the PN, and this is independent of the initial composition of the progenitors.
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Schedule a callMore From: Publications of the Astronomical Society of the Pacific
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