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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1970 Apr;65(4):775–780. doi: 10.1073/pnas.65.4.775

The [NeIV] Lines in High Excitation Gaseous Nebulae

Lawrence H Aller 1
PMCID: PMC282982  PMID: 16591822

Abstract

The „forbidden” lines of three times ionized neon are among the most precious indicators of electron temperature and excitation. They are also predicted to be among the strongest lines observed in the far ultraviolet spectra of high excitation nebulae.

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