Astron. Astrophys. Suppl. Ser. 131, 145-152
A. Burgess1 - M.C. Chidichimo2 - J.A. Tully3
1 - Department of Applied Mathematics and Theoretical Physics, Silver Street, Cambridge CB3 9EW, UK
2 - Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
3 - Département G.D. Cassini, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
Received September 25, 1995; accepted January 2, 1998
Using an extension of the method for compacting atomic data set out by Burgess & Tully (1992), we make concise fits to a selection of the set of collision strengths given by Zhang et al. (1990) for Li-like ions from O+5 to U+89. We carry out thermal averaging and fit the resulting effective collision strengths . A compact or table of cardinal values for each transition allows one to reproduce the T and Z dependent to better than 1 per cent. The present study is for the forbidden transitions and .
Key words: Li-like ions -- electron excitation -- compact atomic data