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

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4. Summary

The ultraviolet spectrum of KQ Puppis contains a large number of Fe II emission lines, and we give wavelengths and designations for all 102 lines observed in high resolution IUE spectra. These are all pure emission line profiles. We do not discuss the more optically thick P-Cygni type transitions. We also give wavelengths and designations for 127 of the strongest PCR channels and list them with their respective emission lines. We discuss some earlier work suggesting various excitation mechanisms for Fe II in KQ Puppis, e.g. photoexcitation and dielectronic recombination. However, we propose that all of the Fe II emission lines can be explained by either selective photoexcitation by continuum radiation (PCR) from the B-star companion, or photoexcitation by accidental resonance (PAR), by the H Ly [FORMULA] radiation field. We also point out that these processes result in a flux redistribution towards longer wavelengths, i.e. that they are fluorescence processes.

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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