Atomic data from the IRON Project

Free access article

Issue		A&A Volume 394, Number 2, November I 2002


Page(s)		753 - 762
Section		Atomic and molecular data
DOI		http://dx.doi.org/10.1051/0004-6361:20021091

A&A 394, 753-762 (2002)
DOI: 10.1051/0004-6361:20021091

LI. Electron impact excitation of Fe IX

P. J. Storey¹, C. J. Zeippen² and M. Le Dourneuf³

¹ Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
² LUTH (FRE 2462 associée au CNRS et à l'Université Paris 7), Observatoire de Paris, 92195 Meudon, France
³ Laboratoire PALMS (UMR 6627 du CNRS - Université de Rennes 1), Équipe SIMPA, Campus de Beaulieu, Université de Rennes 1, 35042 Rennes Cedex, France

(Received 29 May 2002 / Accepted 23 July 2002 )

Abstract
We calculate collision strengths and thermally averaged collision strengths for electron excitation between the one hundred and forty energetically lowest levels of Fe ⁸⁺. The scattering target is more elaborate than in any earlier work and large increases are found in the excitation rates among the levels of the 3s ²3p ⁵3d electron configuration due to resonance series that have not been considered previously. The implications for solar and stellar spectroscopy have been discussed elsewhere (Storey & Zeippen 2001). We correct some errors that were made in generating the figures given in that paper and present corrected versions.

Key words: Sun: general -- atomic data -- Sun: UV radiation

Offprint request: P. J. Storey, PJS@star.ucl.ac.uk

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