Volume 387, Number 3, June I 2002
|Page(s)||1135 - 1145|
|Published online||17 May 2002|
Effective recombination coefficients for lines at nebular temperatures and densities *
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, firstname.lastname@example.org
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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