Photoionization Models for Planetary Nebulae with Inhomogeneous Chemical Composition

Details Photoionization Models for Planetary Nebulae with Inhomogeneous Chemical Composition Photoionization Models for Planetary Nebulae with Inhomogeneous Chemical Composition

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..142p&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Astronomy and Astrophysics

Astronomy

20

Planetary Nebulae: Abundances, Planetary Nebulae: Individual (Ngc 6153)

Scientific paper

Considering the prototypical case of NGC 6153, it is shown that photoionization models comprising two components with different chemical compositions can account quantitatively for most of the spectral features of those planetary nebulae in which the optical recombination lines seem to indicate abundances much larger than the collisionally excited lines. Contrary to a common belief, the recombination lines then no longer reflect the average nebular abundances. In particular, fluctuations of composition within PNe may lead to overestimation of the helium abundance.

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