Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88...15w&link_type=abstract
Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 15-22. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
29
Companion Stars, Eclipsing Binary Stars, Magellanic Clouds, Stellar Evolution, Stellar Radiation, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Iue, Radial Velocity, Stellar Mass Ejection, Stellar Spectra
Scientific paper
IUE and ground-based spectrograms of the luminous Hubble-Sandage variable S Doradus of the Large Magellanic Cloud are presented. The two low-resolution IUE spectrographs covering the range 1150-3100 A are found to be dominated by strong absorption features of singly ionized metallic lines, with the resonance lines of C IV at 1548 and 1551 A and of Si IV at 1394 and 1402 A also apparent. High-resolution ground based coude spectrograms otained at stellar maximum reveal V magnitudes in agreement with IUE values and are dominated by strong Balmer lines and metallic lines characteristic of spectral type A2-A5. The observed continuum energy distribution is explained by the superposition of the radiation of an early A type supergiant photosphere and a surrounding envelope which produces Balmer continuum radiation. The visual line profiles indicate a time-dependent mass loss rate of approximately 0.0007 solar masses/year, and implications of this very strong mass loss on the evolution of S Dor are discussed.
Appenzeller Immo
Cassatella Angelo
Wolf Bernd
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