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A Possible Subdivision of Type II Planetary Nebulae

Published online by Cambridge University Press:  19 July 2016

M. Faúndez-Abans  and
W. J. Maciel
M. Faúndez-Abans
Affiliation:
Laboratório Nacional de Astrofísica/ON/CNPq/MCT, Caixa Postal 21, 37500 Itajubá MG, Brasil
W. J. Maciel
Affiliation:
Instituto Astronômico e Geofísico da USP, Caixa Postal 30.627, 01051 São Paulo SP, Brasil

Extract

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A revision is made of the classification scheme of planetary nebulae proposed by Peimbert (1978), taking into account the observed heavy-element abundances and radial abundance gradients (Faúndez-Abans and Maciel, 1986; 1987a). A subdivision is proposed of type II PN into the subtypes a and b, according to their nitrogen abundances relative to hydrogen (Faundez-Abans and Maciel, 1987b). Type IIa PN show a higher enrichment in nitrogen than type IIb, which present a nitrogen abundance close to the value of population I objects and a radial N/H gradient as well.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 222
Copyright
Copyright © Kluwer 1989 

References

Faúndez-Abans, M., Maciel, W. J. 1986, Astron. Astrophys. 158, 228 Google Scholar
Faúndez-Abans, M., Maciel, W. J. 1987a, Astrophys. Space Sci. 129, 353 CrossRefGoogle Scholar
Faúndez-Abans, M., Maciel, W. J. 1987b, Astron. Astrophys. (in press) Google Scholar
Peimbert, M. 1978, IAU Symp. 76, ed. Terzian, Y., Reidel, p. 215 Google Scholar