Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..687p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, June 1991, p. 687-713.
Astronomy and Astrophysics
Astrophysics
97
Abundance, Data Correlation, Planetary Nebulae, Carbon, Chemical Composition, Helium, Neon, Nitrogen, Oxygen, Stellar Evolution
Scientific paper
To form a critical compilation of the abundances of He, C, N, O and Ne, all the individual determinations of chemical abundances in PN obtained with linear detectors have been considered. The data cover all observations of the Galactic PN made in the 20 years up to the end of 1989. Average chemicql abundances have been evaluated separately for nebulae of type I and of types II-III of Peimbert. For the first, they are He/H = 0.137, C/H = 8.72, N/H = 8.60, O/H = 8.66, and Ne/H = 8.05. For the second they are He/H = 0.103, C/H= 8.82, N/H = 8.07, O/H = 8.66, and Ne/H = 7.99, in the usual units. The data analysis suggests that the enrichment of nitrogen in type I PNs is due mostly to the ON cycle, while that in PNs of type II-III is due mostly to the CN cycle.
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