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Physical Processes in Nebular Shells and the Interpretation of Nebular Spectra

Published online by Cambridge University Press:  18 September 2017

J. Patrick Harrington
J. Patrick Harrington*
Affiliation:
University of Maryland

Abstract

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Computed models are now recognized as useful tools for interpretation of the spectra of planetary nebulae. However, even the most detailed models need geometrical parameters such as filling factors which are poorly determined by observations. Some effects may be seen more clearly by modeling the stratification than by just using total fluxes. A simple model for NGC 6720 is presented which reproduces the behavior of (Ne III) λ3869 observed by Hawley and Miller (1977), clearly showing the effects of charge transfer. The behavior of C II λ4267 remains puzzling. Finally, we comment on the interaction of high velocity stellar winds with nebular shells. Non-equilibrium particle distributions at the contact between the shocked stellar wind and the nebula may result in the rapid cooling of the shocked gas.

Type
Section II: Physical Processes in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 103: Planetary Nebulae , 1983 , pp. 219 - 227
Copyright
Copyright © Reidel 1983 

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