| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 131, Number 1, July 1998
|
|
|---|---|---|
| Page(s) | 145 - 152 | |
| DOI | https://doi.org/10.1051/aas:1998258 | |
| Published online | 15 July 1998 | |
Forbidden transitions in Li-like ions:
Compact effective collision strengths for
where
*
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 e-mail: tully@obs-nice.fr
Received:
25
September
1995
Accepted:
2
January
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
© European Southern Observatory (ESO), 1998