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Astron. Astrophys. 317, 262-264 (1997)

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Research Note

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

D. Petrini 1 and E.P. da Silva 2

1 Observatoire de la Côte d'Azur, Department G. D. Cassini, BP 229, F-06304 Nice Cedex 4, France (e-mail: petrini@obs-nice.fr)
2 Departamento de Fsica, Universidade Federal, CP 6030, Fortaleza, Cearà, Brazil 60450 (e-mail: euclimar@fisica.ufc.br)

Received 19 April 1996 / Accepted 22 May 1996


Soft X-ray irradiation on low density cold matter K-ionizes neutral carbon. The complete ionization process, single ionization and shake-off processes, followed by Auger decay produces excited states of C III and C IV ions. Consequently C III and C IV UV lines are produced directly with comparable intensities. Some relative intensities of observable lines are calculated.

Key words: atomic processes — atomic data — X-rays: general — ultraviolet: general

Send offprint requests to: D. Petrini

© European Southern Observatory (ESO) 1997