Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phys...35..470j&link_type=abstract
(IUPAP, International Conference on Vacuum Ultraviolet Radiation Physics, 8th, Lund, Sweden, Aug. 4-8, 1986) Physica Scripta (IS
Astronomy and Astrophysics
Astronomy
Cool Stars, Emission Spectra, Stellar Atmospheres, Ultraviolet Astronomy, Extreme Ultraviolet Radiation, Giant Stars, Line Spectra, Spaceborne Astronomy, Stellar Spectra, Supergiant Stars
Scientific paper
High resolution far ultraviolet (1200-2000 A) spectra of 17 cool giant and supergiant stars have been obtained using the IUE satellite of ESA, NASA and UK. The line intensities, wavelengths and widths of approximately 200 EUV emission lines in these spectra were measured using a least squares Gaussian fitting technique. The observations include lines from C I, C II, C IV, S I, O I, O IV, Si II, Si IV, N V, Al III, Fe II and Mg II. These lines are mostly formed by radiative processes in the extremely rarefied plasma in the outer stellar atmospheres, and occasionally involve highly excited energy levels of the atoms and ions. The temperature of formation ranges from about 5000 to 100,000 K, corresponding to different depth levels in the atmosphere, and the lines serve as a valuable tool for probing the physical conditions in these regions.
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