Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26as...25..193s&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 25, Aug. 1976, p. 193-212. Research supported by the Fonds de la Recherche F
Astronomy and Astrophysics
Astrophysics
19
B Stars, Early Stars, Iron, Stellar Spectra, Ultraviolet Spectra, Angular Velocity, Stellar Luminosity, Stellar Motions, Stellar Spectrophotometry, Supergiant Stars
Scientific paper
A systematic analysis of low-resolution TD1 S2/S68 data on B stars is performed in order to detect correlations between the intensity of Fe III features (1550 and 1940 A) appearing on the spectrophotometric tracings and the spectral types or luminosities of the stars considered. The case of one star whose spectrum reveals strong Fe III absorption at 1940 A is then studied in detail: Theta Ara. Line identifications are given for a high-resolution Copernicus spectrum of this hot supergiant in the region 1820-2200 A, and a comparison between observations and predictions based on classical stellar atmosphere models is performed and discussed. Theta Ara is also compared in the ultraviolet and the visible with other early-type supergiants, such as Beta CMa, Omicron-2 CMa, Beta Cen, Epsilon Ori. The rotational velocity is briefly discussed and shown to be lower when deduced from the Copernicus UV spectra.
Klutz M.
Peytremann Eric
Swings Jean Pierre
Vreux Jean-Marie
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