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Astron. Astrophys. 349, 996-1002 (1999)

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Photoionization cross sections for Fe XVI and Fe XVII recombination rate coefficients

D. Donnelly, K.L. Bell, W.G.V. Darlington, R.H.G. Reid and F.P. Keenan

School of Mathematics and Physics, The Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland

Received 27 January 1999 / Accepted 4 June 1999


The Breit-Pauli R-matrix codes are utilized in a detailed study of the photoionization of the ground state of Fe XVI ([FORMULA]). High resolution total and partial cross sections are obtained using 37 [FORMULA] configuration interaction type wavefunctions to represent the residual ion, Fe XVII, after [FORMULA], [FORMULA] and [FORMULA] photoionization. For the total cross section, the work of Verner et al. and previous Opacity Project calculations are in fair agreement with the present results, while relativistic effects are seen to have a noticeable but not an overly significant effect on the background cross section. The derived partial cross sections are used in a calculation of rates for the recombination of states of Fe XVII to the ground state of Fe XVI.

Key words: atomic data – atomic processes

Send offprint requests to: K.L. Bell (kl.bell@qub.ac.uk)

© European Southern Observatory (ESO) 1999

Online publication: September 13, 1999