Abundances in type I planetary nebulae: is the galactic disk presently oxygen deficient?

Details Abundances in type I planetary nebulae: is the galactic disk presently oxygen deficient? Abundances in type I planetary nebulae: is the galactic disk presently oxygen deficient?

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..924c&link_type=abstract

Astronomy and Astrophysics, v.313, p.924-928

Astronomy and Astrophysics

Astrophysics

8

Planetary Nebulae: General, Stars: Abundances, Galaxy: Abundances

Scientific paper

We report new spectroscopic observations for a sample of "bona fidae" type I planetary nebulae, which satisfy kinematical, distance to the galactic plane and morphological criteria. Special care was taken to estimate physical parameters as electron temperature and density. The mean sample oxygen abundance ɛ(O)=8.64+/-0.23 confirms our earlier results: a deficiency of about 0.25dex with respect to the solar value. We emphasize that the present result is entirely compatible with new stellar (Cunha & Lambert 1994) and diffuse gas data (Meyer et al. 1994) recently obtained in the Orion complex.

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