Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..467s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 467-475.
Astronomy and Astrophysics
Astrophysics
33
Nitrogen, Planetary Nebulae, Stellar Mass, Abundance, Hertzsprung-Russell Diagram, Oxygen, Stellar Evolution, Stellar Models
Scientific paper
A sample of 86 planetary nebulae was selected for which it was possible to determine the N/O ratios and to estimate the masses of their central stars by comparison with theoretical stellar evolutionary tracks as modified by the presence of a nebula. It is found that there is a correlation between N/O and the central star mass. This is the first time that evidence for such a correlation has been shown quantitatively. The results challenge the findings of the current dredge-up theory, in the sense that stellar evolution models are unable to predict enough nitrogen enrichment for the range of central star masses obtained in this work.
Stasinska Grazina
Tylenda Romuald
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