Volume 382, Number 1, JanuaryIV 2002
|Page(s)||282 - 290|
|Published online||15 January 2002|
Study of electron density in planetary nebulae
A comparison of different density indicators
Laboratório de Análise Numérica e Astrofísica, Departamento de Matemática, Universidade Federal de Santa Maria, 97119-900 Santa Maria, RS, Brazil
2 Physics Department, University of Cincinnati, Cincinnati OH 45221-0011, USA
Corresponding author: M. V. F. Copetti, firstname.lastname@example.org
Accepted: 7 November 2001
We present a comparison of electron density estimates for planetary nebulae based on different emission-line ratios. We have considered the density indicators λ3729/λ3726, λ6716/λ6731, λ5517/λ5537, λ4711/λ4740, ] λ1906/λ1909 and λ5202/λ5199. The observational data were extracted from the literature. We have found systematic deviations from the density homogeneous models, in the sense that: and We argue that the lower  density estimates are likely due to errors in the atomic parameters used.
Key words: ISM: planetary nebulae
© ESO, 2002
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