Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-16
Astronomy and Astrophysics
Astrophysics
4 pages, Accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20054375
The Si III] 1892A intercombination line shows an anomalously high intensity in spectra of the radiation-rich Weigelt blobs in the vicinity of Eta Carinae. The line disappears during the 100 days long spectral events occurring every 5.5 years. The aim is to investigate whether resonance-enhanced two-photon ionization (RETPI) is a plausible excitation mechanism for the Si III] 1892A line. The possible intensity enhancement of the 1892A line is investigated as regards quasi-resonant intermediate energy levels of Si II. The RETPI mechanism is effective on SiII in the radiation-rich Weigelt blobs where the two excitation steps are provided by the two intense hydrogen lines Ly alpha and Ly gamma
Hartman Henrik
Johansson Sara
Letokhov V. S.
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