| Issue |
A&A
Volume 382, Number 1, JanuaryIV 2002
|
|
|---|---|---|
| Page(s) | 282 - 290 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20011621 | |
| Published online | 15 January 2002 | |
Study of electron density in planetary nebulae
A comparison of different density indicators
1
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, mvfc@lana.ccne.ufsm.br
Received:
29
August
2001
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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