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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 

References

Allen, C.W. (1964) Astrophysical Quantities, The Athlone Press, London, Chapter 4.CrossRefGoogle Scholar
Aller, L.H. (1956) Gaseous Nebulae, Chapman and Hall, London, p. 130.Google Scholar
Aller, L.H. (1964) Astrophys. Norw., 9, 293.Google Scholar
Bely, O., Tully, J., Van Regemorter, H. (1963) Ann. Phys., 8, 303.Google Scholar
Czyzak, S.J., Krueger, T.K., Martins, P. de A.P., Saraph, H.E., Seaton, M.J., Shemming, J. (1968) in the present volume, p. 138.Google Scholar
Garstang, R.H. (1968) in the present volume, p. 143.Google Scholar
Harman, R.J., Seaton, M.J. (1966) Mon. Not. R. astr. Soc., 132, 15.Google Scholar
Heddle, D.W.O. (1964) Ann. Astrophys., 27, 800.Google Scholar
Hummer, D.G., Seaton, M.J. (1964) Mon. Not. R. astr. Soc., 127, 217.Google Scholar
Osterbrock, D.E. (1963) Planet. Space Sci., 11, 621.Google Scholar
Seaton, M.J. (1960) Rep. Progr. Phys., 23, 313.Google Scholar
Wilson, O.C. (1950) Astrophys. J., 111, 279.Google Scholar