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Uv Spectra of Nebulae and Novae

Published online by Cambridge University Press:  12 April 2016

M.J. Seaton
M.J. Seaton*
Affiliation:
Department of Physics and Astronomy, University College London London WC1E 6BT, England

Extract

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Optical spectra of nebulae and novae are dominated by recombination lines of H I, Be I and He II and by forbidden lines, such as those of [0 III]. Their IR spectra show the fine-structure lines and continua due to dust. Most of the lines observed in the UV (say from 3000 to 1200 Å) are either due to resonance transitions (e.g. C IV 1549) or are of intercombination type (e.g. C III] 1908). Some elements do not have many lines in the optical - nitrogen gives only [N II] and there are no forbidden lines of ionized carbon - and for such elements much valuable information is provided by UV lines (e.g. N III], N IV], N V, C II], C III] and C IV). Carbon/oxygen abundance ratios deduced from combined UV and optical observations agree well with those deduced from IR continuum features (Seaton, 1983).

Type
Session 3. Non-Solar Astrophysics
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 67
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

Clegg, R.E.S., Seaton, M.J., Peimbert, M. and Torres-Peimbert, S., 1983. MN, 205, 417.Google Scholar
Seaton, M.J., 1983. IAU Symposium 103, p. 129.Google Scholar
Snijders, M.A.J., Batt, T.J., Seaton, M.J., Blades, J.C. and Morton, D.C. 1984. MN, submitted.Google Scholar
Stickland, D.J., Penn, C.J., Seaton, M.J., Snijders, M.A.J. and Storey, P.J., 1981. MN, 197, 107.Google Scholar
Storey, P.J., 1981. MN, 195, 27P.Google Scholar
Williams, R.E., Ney, E.P., Sparks, W.M., Starrfield, S.G., Truran, J.W. and Wyckoff, S., 1984. MN, submitted.Google Scholar