Abundance Patterns in Planetary Nebulae

Details Abundance Patterns in Planetary Nebulae Abundance Patterns in Planetary Nebulae

1999-09-17

arxiv.org/abs/astro-ph/9909310v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; to appear in "Asymmetrical Planetary Nebulae II: From Origins to Microstructures," ASP Conference Series,

Scientific paper

We previously determined abundances of He, C, N, O, and Ne for a sample of planetary nebulae (PNe) representing a broad range in progenitor mass and metallicity, and we now compare them with theoretical predictions of PNe abundances from a grid of intermediate-mass star models. We find very good agreement between observations and theory, lending strong support to our current understanding of nucleosynthesis in stars below 8Mo in birth mass. In particular, C and N abundance patterns are consistent with the occurrence of hot-bottom burning in stars above roughly 3.5Mo, a process that converts much of 12C into 14N during the AGB phase. This agreement also supports the validity of published stellar yields of C and N in the study of the abundance evolution of these elements.

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