Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..133t&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, May 15, 1980, p. 133-139.
Astronomy and Astrophysics
Astrophysics
91
Abundance, Carbon, Iue, Orion Nebula, Planetary Nebulae, Visual Observation, Ultraviolet Spectra
Scientific paper
The paper presents IUE and optical observations of the Orion Nebula and of the planetary nebula IC 418. Based on these data, log C = 8.5, log O = 8.6 and log N = 7.7 for the Orion Nebula, and log C = 9.0, log O = 8.7 and log N = 7.9 for IC 418 are obtained. These results imply that: (1) lambda-4267 is produced mainly by recombination and provides a reliable method to determine the C(2+) abundance, (2) the Orion nebula has a C/O ratio similar to the solar one, and (3) planetary nebulae show freshly made carbon in their envelopes.
Daltabuit Enrique
Peimbert Manuel
Torres-Peimbert Silvia
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