Astron. Astrophys. Suppl. Ser. 133, 257-269

Recombination coefficients for Neii lines at nebular temperatures and densities

R. Kisielius ¹ - P.J. Storey ¹ - A.R. Davey ² - L.T. Neale ¹

Send offprint request: P.J. Storey

1 - Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2 - Department of Physics, Montana State University, Bozeman, MT 59717-3840, U.S.A.

Received May 25; accepted June 9, 1998

Abstract:

We calculate total recombination coefficients for Ne²⁺$\; +\; {\rm e}^-$ and effective recombination coefficients for the formation of selected lines of Neii. New photoionization data are calculated which accurately map the near threshold resonances and are used to derive recombination coefficients for principal quantum numbers, $n \leq 15$, 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 -- H II regions -- planetary nebulae: general