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Summary: The O iv and S iv intercombination lines in the ultraviolet
spectra of astrophysical sources
F.P. Keenan 1 , S. Ahmed 1 , T. Brage 2 , J.G. Doyle 3 , B.R. Espey 4 , K.M.
Exter 5 , A. Hibbert 6 , M.T.C. Keenan 7 , M.S. Madjarska 3 , M.
Mathioudakis 1 and D.L. Pollacco 1
1 Department of Pure and Applied Physics, Queen's University, Belfast BT7 1NN
2 Kurslab LU, Department of Physics, University of Lund, S{221 00, Lund, Sweden
3 Armagh Observatory, Armagh BT61 9DG
4 Physics Department, Trinity College Dublin, Dublin 2, Ireland
5 School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion
Square, Dublin 2, Ireland
6 Department of Applied Mathematics and Theoretical Physics, Queen's University,
Belfast BT7 1NN
7 Hazelwood College, 70 Whitewell Road, Belfast BT36 7ES
Abstract.
New electron density diagnostic line ratios are presented for the O iv 2s 2 2p 2 P{
2s2p 2 4 P and S iv 3s 2 3p 2 P{3s3p 2 4 P intercombination lines around 1400 A. A
comparison of these with observational data for the symbiotic star RR Telescopii
(RR Tel), obtained with the Space Telescope Imaging Spectrograph (stis), reveals
generally very good agreement between theory and observation. However the S iv
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