The classification of planetary nebulae

Details The classification of planetary nebulae The classification of planetary nebulae

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..324f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 324-326. Research supported by the Fundacao de Ampa

Astronomy and Astrophysics

Astrophysics

39

Abundance, Classifying, Nitrogen, Planetary Nebulae, Heavy Elements, Hydrogen

Scientific paper

The classification scheme of planetary nebulae proposed by Peimbert
(1978) is revised, taking into account the observed heavy-element
abundances and radial abundance gradients. The so-called type II nebulae
are further divided into the subtypes a and b, according to their
nitrogen abundance relative to hydrogen.

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