Theoretical Models of Planetary Nebulae - Part Three
Abstract
Theoretical models are attempted for eight moderate excitation planetary nebulae which have been intensively observed with the image-tube scanner at Lick and in other investigations. The models are uniform density structures, often truncated, with central star energy distributions and chemical compositions so adjusted as to give an optimum fit with the observations. Although a satisfactory representation can be obtained for most of the stronger, usually observed lines, those arising from the 3p 3 configuration, specifically the nebular transitions of [S ii], [Cl iii], and [Ar iv], often give difficulties. A comparison with results of model predictions with those from simple, traditional procedures generally shows a good agreement, except in those instances where different judgments are made in interpreting emissions of ions of 3p n configurations.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- February 1980
- DOI:
- 10.1007/BF00642389
- Bibcode:
- 1980Ap&SS..67..349A
- Keywords:
-
- Astronomical Models;
- Planetary Nebulae;
- Abundance;
- Chemical Composition;
- Forbidden Transitions;
- Ion Distribution;
- Ionization;
- Line Spectra;
- Positive Ions;
- Spectral Energy Distribution;
- Stellar Structure;
- Astrophysics