The symbiotic stellar lines at 6830 A, 7088 A - an origin in optically thick fluorescence

Details The symbiotic stellar lines at 6830 A, 7088 A - an origin in optically thick fluorescence The symbiotic stellar lines at 6830 A, 7088 A - an origin in optically thick fluorescence

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.185..265k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 185, no. 2, Nov. 1991, p. 265-275.

Astronomy and Astrophysics

Astrophysics

1

Fluorescence, Line Spectra, Optical Thickness, Stellar Spectra, Symbiotic Stars, Iron, Oxygen, Raman Spectra, Spectral Line Width, Ultraviolet Spectra

Scientific paper

The question of the origin of the symbiotic stellar lines at 6830 A and 7088 A, recently proposed to arise from Raman scattering of ultraviolet O VI lines by hydrogen, is examined quantitatively by comparing line intensities expected from this process with the intensity of an Fe II line photoexcited by one of the same O VI lines. It appears that Raman scattering does not yield sufficient intensity to account for the symbiotic lines. An alternative mechanism for producing the lines exists, however,in off-line-center photoexcitation of optically thick hydrogen by the O VI lines. This gives intensities which are higher than Raman intensities, and which are more consistent with the Fe II fluorescent line intensity. Observed further redward shifts are also explained by the mechanism. It is therefore suggested that the proposed hypothesis of O VI-H I interaction may be valid, but that the process involved is probably not second-order Raman scattering but first-order fluorescent scattering.

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