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Why is IC 4642 of such High-Excitation Class?

Published online by Cambridge University Press:  18 September 2017

C.J. Penn ,
D.R. Flower ,
M.J. Barlow ,
M.J. Seaton  and
L. H. Aller
C.J. Penn
Affiliation:
Department of Physics, University of Durham
D.R. Flower
Affiliation:
Department of Physics, University of Durham
M.J. Barlow
Affiliation:
Department of Physics & Astronomy, University College London
M.J. Seaton
Affiliation:
Department of Physics & Astronomy, University College London
L. H. Aller
Affiliation:
Department of Astronomy, University of California, Los Angeles

Extract

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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.

Type
Abstracts of Contributed Papers
Information
Symposium - International Astronomical Union , Volume 103: Planetary Nebulae , 1983 , pp. 539
Copyright
Copyright © Reidel 1983