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The Ultraviolet Emission Spectra of Planetary Nebulae

Published online by Cambridge University Press:  14 August 2015

D.R. Flower
D.R. Flower*
Affiliation:
Dept. of Physics, University College London, England

Abstract

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Calculations show that high-excitation planetaries emit about the same total intensity of collisionally excited radiation in the unobserved ultraviolet part of the spectrum as in the visible. This ultraviolet radiation emanates from a central zone where the electron temperature is high due to absorption of He II Ly-α photons. Intensities of lines which one might expect to detect in the ultraviolet have been calculated using revised atomic data and a detailed model of the ionization and thermal structure of the central zone. Relative line intensities are presented for a wide range of excitation in the nebula. In particular, the absolute intensity of the C IV doublet at 1550 Å has been calculated for 4 selected planetaries.

Type
Session II – Observations
Information
Symposium - International Astronomical Union , Volume 34: Planetary Nebulae , 1968 , pp. 77 - 86
Copyright
Copyright © Reidel 1968 

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