S I emission in EUV spectra of late-type stars

Astronomy and Astrophysics – Astronomy

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Far Ultraviolet Radiation, Late Stars, Line Spectra, Stellar Spectra, Sulfur, Ultraviolet Spectra, Atomic Energy Levels, Giant Stars, Iue, Opacity, Supergiant Stars

Scientific paper

Observations of strong neutral sulfur emission lines in the EUV spectra of late-type giant and supergiant stars are discussed. Low- and high-resolution spectra of Alpha Tauri and Beta Gru are presented which demonstrate the contribution of the S I (UV 9) multiplet to the observed features at approximately 1296 A as well as the strong O I multiplet at 1304 A. S I lines which must be taken into consideration in the analysis of stellar spectra are also found at 1807.34, 1820.36 and 1826.26 A (UV 2) in the vicinity of Si II lines, at 1900.27 and 1914.68 A (UV 1), at 1474.0 and 1474.4 A (UV 3), and possibly near 1640 A (UV 5). Evidence of photoexcitation and high line opacities of neutral S is pointed out, and it is noted that the opacities together with absolute fluxes can provide information on atmospheric structure.

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