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Astron. Astrophys. 326, 870-872 (1997)
Research Note
N III and N IV line emission following K-shell photoionization
D. Petriniand F.X. de Araújo 1, 2
1 Observatoire de la Côte d'Azur, Department
G. D. Cassini, BP 4229, F-06304 Nice Cedex 4,
France (e-mail: petrini@obs-nice.fr)
2 CNPq-Observatório Nacional, DAGE, 77 Rua
José Cristino, Rio de Janeiro, CEP 20921-400, Brazil
(e-mail: araujo@dage1.on.br)
Received 21 March 1997 / Accepted 12 May 1997
Abstract
Soft X-ray irradiation of low density cold matter K-ionizes neutral nitrogen. The full ionization process followed by Auger decay populates the excited states of N III and N IV ions. N III and N IV uv lines are therefore produced directly with comparable intensities. Some observable intensity ratios are evaluated.
Key words: atomic processesatomic dataUV: generalX-rays: general
Send offprint requests to: D. Petrini
Contents
© European Southern Observatory (ESO) 1997
Online publication: October 15, 1997
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