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Astron. Astrophys. 364, 646-654 (2000)

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The Fe II excitation mechanism in KQ Puppis

A. Redfors 1 and S.G. Johansson 2

1 Kristianstad University, 291 88 Kristianstad, Sweden
2 Lund University, Physics Department, Atomic Spectroscopy, Box 118, 221 00 Lund, Sweden

Received 23 June 2000 / Accepted 22 September 2000


We discuss different excitation processes behind the Fe II emission lines in the IUE spectrum of KQ Puppis (Boss 1985), a VV Cephei type of spectroscopic binary. Several papers have been published on the subject suggesting a number of processes behind the strong Fe II emission lines. We propose that there are two processes operating: selective photoexcitation by continuum radiation (PCR) from the B-star companion, and photoexcitation by accidental resonance (PAR) by the H Ly [FORMULA] radiation field. We suggest excitation channels for each of the Fe II emission lines identified in the spectrum.

Key words: atomic data – atomic processes – stars: binaries: spectroscopic – stars: individual: KQ Puppis

Send offprint requests to: A. Redfors

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001