Study of electron density in planetary nebulae. A comparison of different density indicators

Details Study of electron density in planetary nebulae. A comparison of different density indicators Study of electron density in planetary nebulae. A comparison of different density indicators

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...382..282c&link_type=abstract

Astronomy and Astrophysics, v.382, p.282-290 (2002)

Astronomy and Astrophysics

Astrophysics

16

Ism: Planetary Nebulae

Scientific paper

We present a comparison of electron density estimates for planetary nebulae based on different emission-line ratios. We have considered the density indicators [O Ii]lambda 3729/lambda 3726, [S Ii]lambda 6716/lambda 6731, [Cl Iii]lambda 5517/lambda 5537, [Ar Iv]lambda 4711/lambda 4740, C Iii]lambda 1906/lambda 1909 and [N I]lambda 5202/lambda 5199. The observational data were extracted from the literature. We have found systematic deviations from the density homogeneous models, in the sense that: Ne(ion {N}i) <~ Ne(ion {O}{ii}) < Ne(ion {S}{ii}, ion {C}{iii}, ion {Cl}{iii} or ion {Ar}{iv}) and Ne(ion {S}{ii}) ~ Ne(ion {C}{iii}) ~ Ne(ion {Cl}{iii}) ~ Ne(ion {Ar}{iv}). We argue that the lower [O Ii] density estimates are likely due to errors in the atomic parameters used.

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