Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..480d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 480-491.
Astronomy and Astrophysics
Astrophysics
63
Abundance, Early Stars, Magellanic Clouds, Photoionization, Planetary Nebulae, Astronomical Models, Hertzsprung-Russell Diagram, Metallicity, Optical Thickness
Scientific paper
Self-consistent photoionization modeling of 44 Magellanic Cloud PNe is used to construct an H-R diagram for the central stars in both Clouds and is used to obtain the nebular chemical abundances and the physical parameters of the nebulae. The type I PNe are the youngest PNe in the clouds, have the highest core masses, and lie on the descending branch of the evolutionary tracks. These objects show correlated He and N/O abundance enhancements. The nebulae mass of the optically thick objects is well correlated with the nebular radius. Clear evidence is found for an abundance scatter in the material which formed the precursor star of the PNe in both Clouds. The metallicity range in the LMC is a factor of about 10, while that in the SMC is about 3-4. A core-mass:metallicity relationship is discovered for the LMC and is interpreted as a transformed age:metallicity relationship.
Dopita Mike A.
Meatheringham Stephen J.
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