Abstract
A progress report is given of investigations related to observations of stellar spectra obtained with the ultraviolet stellar spectrophotometer S59 aboard the ESRO TD-1A satellite. We describe first the processing of the observations: intensity and wavelength calibration, identification of lines, classification of spectra. Thereafter some important groups of lines are dealt with: non-LTE computation of the Mgii lines are presented: apart from the peculiar emission line and shell stars they compare well with the observations; intensity ratios, of Feii and Feiii lines are an important temperature classification criterion. Interstellar UV lines indicate large deficiencies of some metals, as compared to solar values. A new ultraviolet continuous extinction curve is determined. We discuss the strong outstreaming motions observed in α Cygni, and the consequent mass loss of this star (< 3 × 10−10 \(\mathfrak{M}_ \odot \) yr−1and finally we describe the composite spectrum of the (WC8+09I) bnary γ2 Velorum; the ultraviolet continuous spectrum of the WC star is about one magnitude brighter than any theory predicts.
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De Jager, C., Lamers, H.J.G.L.M. & Van Der Hucht, K.A. Progress in ultraviolet stellar spectrophotometry with S59. Astrophys Space Sci 38, 313–325 (1975). https://doi.org/10.1007/BF00647130
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DOI: https://doi.org/10.1007/BF00647130