Astrophysical laser operating in the OI 8446-Åline in the Weigelt blobs of η Carinae

Details Astrophysical laser operating in the OI 8446-Åline in the Weigelt blobs of η Carinae Astrophysical laser operating in the OI 8446-Åline in the Weigelt blobs of η Carinae

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.364..731j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 364, Issue 1, pp. 731-737.

Astronomy and Astrophysics

Astronomy

4

Atomic Processes, Line: Formation, Radiation Mechanisms: Non-Thermal, Stars: Individual: Η Carinae, Infrared: Stars

Scientific paper

Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star η Carinae, we explain the presence of the fluorescent 8446-Åand forbidden [OI] 6300-Ålines as well as the absence of the allowed OI 7774-Åline in spectra recorded with the Hubble Space Telescope (HST)/STIS instrument (Gull et al.). From atomic data and estimated stellar parameters we demonstrate that there is a population inversion and stimulated emission in the 3p3P-3s3S transition λ8446 due to photoexcitation by accidental resonance (PAR) by H Lyβ radiation.

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