Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rmxaa..21..517m&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, Vol. 21, p. 517 - 520
Astronomy and Astrophysics
Astronomy
1
Planetary Nebulae: Metal Abundances, Planetary Nebulae: Central Stars
Scientific paper
The authors study a group of planetary nebulae of type II with extremely
low abundances of heavy elements. It is concluded that their central
stars have masses lower than expected from most stellar evolution
calculations.
Codina-Landaberry S. J.
de Freitas Pacheco José Antonio
Maciel Walter J.
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