Reference Entry

forbidden line

Ian Ridpath

in A Dictionary of Astronomy

Second edition

Published in print January 2012 | ISBN: 9780199609055
Published online January 2012 | e-ISBN: 9780191739439
forbidden line

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An emission line in a spectrum that is emitted only by a low-density gas, as in interstellar regions and nebulae.

Reference Entry.  215 words. 

Subjects: Astronomy and Astrophysics

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