Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..429u&link_type=abstract
(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop
Astronomy and Astrophysics
Astronomy
6
Absorption Spectra, B Stars, Main Sequence Stars, Stellar Spectra, Supergiant Stars, Ultraviolet Spectra, Astronomical Models, Graphs (Charts), Line Spectra, O Stars, Oao 2, Resonance, Shell Stars, Spectrum Analysis, Stellar Atmospheres
Scientific paper
OAO-2 spectral scans of several early-type main-sequence stars and the shell star zeta Tau are analyzed to derive a representative UV spectrum for B-type supergiants. The absorption lines in the spectra of the B-type supergiants are shown to be stronger than those in main-sequence stars and to have a broad pointed feature at 1720 A that is constant in all such stars. The UV resonance lines of C IV, N V, Si III, and Si IV are found to be displaced toward the shorter wavelengths by velocities of up to 1800 km/s, indicating an escaping atmosphere. For B5 stars, the atmosphere is estimated to be expanding at about 120 km/s. The spectrum of eta CMa (B5Ia) is found to be well represented by the LTE theory of line formation, the presence of a stationary circumstellar shell, and a slowly expanding model atmosphere.
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