Planetary Nebula Abundances, Stellar Yields, And The Galactic Evolution of C-12 and N-14

R. B. C. Henry, K. B. Kwitter, J. Buell

A project which aims to understand the abundance patterns of 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…