Abstract
ABSTRACT Copernicus low-resolution (0.2A) observations of 16 O stars, 10 B stars (mostly supergiants), and one WN-A star with the highest data quality between 1000 and 1200A are presented in the form of a classical spectral atlas. The purpose is to survey the systematic spectral-type/luminosity-class dependence of the line features, including those from the stellar winds, in this relatively less studied wavelength range. Perhaps the most important new contribution is the demonstration of the pronounced luminosity effect in the S IV lambda-lambda-1063, 1073 wind profiles, identical to those previously recognized in Si IV lambda-lambda-1394, 1403 and C III lambda-1176, which share essentially the same ionization potential. The stellar-wind effects in O VI lambda-lambda-1032, 1038; P V lambda-lambda-1118, 1128; Si IV lambda-lambda-1122, 1128; and C III lambda-1176 are also described. Attention is redrawn to the unidentified feature at 1099A, which is one of the strongest absorption lines in this range of mid-O through early-B spectra. The atlas will facilitate interpretations of recent Hopkins Ultraviolet Telescope and future Far Ultraviolet Spectroscopic Explorer observations in this wavelength range, as well as sharpen the stellar-wind phenomenology for astrophysical analysis.
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