| Issue |
A&A
Volume 387, Number 3, June I 2002
|
|
|---|---|---|
| Page(s) | 1135 - 1145 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20020263 | |
| Published online | 17 May 2002 | |
Effective recombination coefficients for 
lines
at nebular temperatures and densities
*
1
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2
Institute of Theoretical Physics and Astronomy, A. Goštauto 12, Vilnius, LT-2600, Lithuania
Corresponding author: P. J. Storey, pjs@star.ucl.ac.uk
Received:
1
October
2001
Accepted:
18
February
2002
We calculate effective recombination coefficients for the formation of selected lines
of 
. New photoionization data are computed which accurately map
the near threshold resonances and are used to derive recombination
coefficients for principal quantum numbers, 
, including radiative
and dielectronic recombination. Cascading from higher states is included,
allowing for the effects of finite electron density in a hydrogenic
approximation. The effects of population in the excited states of the
recombining ion are investigated.
Key words: atomic data / line: formation / ISM: HII regions / planetary nebulae: general
© ESO, 2002
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