Searching for Balmer Self-Absorption in Planetary Nebulae

Details Searching for Balmer Self-Absorption in Planetary Nebulae Searching for Balmer Self-Absorption in Planetary Nebulae

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxaa..42..291p&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 42, pp. 291-297 (2006)

Astronomy and Astrophysics

Astronomy

2

Ism: Jets And Outflows, Planetary Nebulae: General

Scientific paper

We analyse the distribution of 482 planetary nebulae (PNe) within the Hα/Hβ - Hγ/Hβ and Hδ/Hγ - Hγ/Hβ planes. Whilst most sources appear to possess case B line ratios, and normal reddening decrements, certain of them also appear to be affected by Balmer self-absorption. We are able to identify 9 possible cases, and 11 probable examples where such absorption is important. Approximately half of these nebulae are compact, and probably quite young. Most previous identifications of self-absorption are shown to be open to doubt, and there is no overlap at all between our present candidates, and those of previous analyses.

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