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Chemical Abundances of Planetary Nebulae in the LMC

Published online by Cambridge University Press:  07 August 2017

J.A. De Freitas Pacheco  and
R.D.D. Costa
J.A. De Freitas Pacheco
Affiliation:
Instituto Astronômico e Geofísico - USP, S. Paulo, Brasil
R.D.D. Costa
Affiliation:
Instituto Astronômico e Geofísico - USP, S. Paulo, Brasil

Extract

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We report new spectroscopic data on a sample constituted of 21 well observed planetary nebulae in the LMC. The observations were performed at the National Laboratory for Astrophysics (Brazópolis — Brasil) using the 1.6m telescope and a CCD detector. Extinction, electron temperature and densities were derived for all the planetaries and a comparison is made with results obtained by other surveys, including common objects. Chemical abundances of helium, nitrogen, oxygen, sulphur and argon were also derived for all sample objects. Enrichment of the progenitor stars in He and N due to mixing episodes as well as the relation with the chemical evolution of the LMC are discussed in terms of our data and other observations.

Type
VI. Planetary Nebulae in Galactic Systems
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 586
Copyright
Copyright © Kluwer 1993