Planetary Nebula Abundances, Stellar Yields, and the Galactic


1 RESUMEN A project which aims to understand the abundance patterns in He, C, N, O, Ne, S, and Ar for a small sample of planetary nebulae is described. Abundance ratios of O/H, C/O, and N/O especially show a broad range relative to their solar values and AGB models used to interpret the patterns indicate that progenitor ranges in mass and metallicity are… (More)


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