IUE and visual observations of the Orion Nebula and IC 418 - The carbon abundance

Astronomy and Astrophysics – Astrophysics

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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.

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