Revised Diagnostic Diagrams for Planetary Nebulae

Details Revised Diagnostic Diagrams for Planetary Nebulae Revised Diagnostic Diagrams for Planetary Nebulae

2006-02-08

arxiv.org/abs/astro-ph/0602201v1

Astronomy and Astrophysics

Astrophysics

6 pages, 7 figures. Accepted for RMAA

Scientific paper

Diagnostic diagrams of electron density - excitation for a sample of 613 planetary nebulae are presented. The present extensive sample allows the definition of new statistical limits for the distribution of planetary nebulae in the log [Ha/[SII]] vs log [Ha/[NII]], log [Ha/[SII]] vs [SII] 6717/6731 and log [Ha/[NII]] vs [SII] 6717/6731 planes. The diagrams provide a good representation of the ranges of physical conditions, indicated by these emission line ratios, present in planetary nebulae during different evolutionary stages.

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