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Astron. Astrophys. 326, 870-872

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Research Note

N III and N IV line emission following K-shell photoionization

D. Petrini1 and F.X. de Araújo2

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


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 processes - atomic data - UV: general - X-rays: general

Send offprint requests to: D. Petrini

© European Southern Observatory (ESO) 1997

Online publication: September 18, 1997
Last change: October 15, 1997