O2 + Recombination Abundances in Planetary Nebulae

Details O2 + Recombination Abundances in Planetary Nebulae O2 + Recombination Abundances in Planetary Nebulae

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..10...42k&link_type=abstract

The Seventh Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows (Eds. William H. Lee and Silvia Torres-Peimbert) Rev

Astronomy and Astrophysics

Astrophysics

1

Ism: Abundances, Planetary Nebulae: General

Scientific paper

We present O2 +/H+ abundances derived from echelle spectroscopy of four planetary nebulae, NGC 6210, NGC 6826, Hu2-1, NGC 6543, from the forbidden, collisionally excited lines, and from the permitted recombination lines. We find that the ratio of the recombination line to collisional line abundances ranges from essentially unity (1.2 for Hu 2-1) to 6.6, for an offset position of NGC 6826, and corresponding t2 values range from 0.016 to 0.087.

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