3D photoionization models and the abundance of Type I PNe

Details 3D photoionization models and the abundance of Type I PNe 3D photoionization models and the abundance of Type I PNe

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe..87g&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

Type I planetary nebulae (PNs), defined as those with high He and N abundances, generally present bipolar geometries and high stellar temperatures. We compare model abundances obtained from a 3 dimensional photoionization code with those obtained from the empirical methods used in the literature. The main goal is to check if the empirically derived He and N overabundances for Type I PNs are real, or a consequence of geometrical effects due the bipolarity and/or to the ionization stratification due to the stellar temperature. We show that the empirical results depend on the particular line of sight. In addition, these results may mimic an overabundance and/or the presence of abundance gradients of He and N in planetary nebulae with high stellar temperature. Geometrical effects are also discussed.

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