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Why is IC 4642 of such High-Excitation Class?
Published online by Cambridge University Press: 18 September 2017
Extract
We have observed IC 4642 with the AAT and the IUE. It is of exceptionally high-excitation class, as judged by ratios such as He II/Hβ and (Ne V)/He II.
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- Copyright © Reidel 1983