Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..340w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 340-344.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Photometry, Magellanic Clouds, Stellar Luminosity, Supergiant Stars, Variable Stars, Emission Spectra, Ionization, Magnesium, Mass Flow, Photosphere, Radiation Pressure, Stellar Winds
Scientific paper
High-resolution spectrograms of the Luminous Blue Variable star S Dor in the LMC, obtained at three epochs during S Dor's present maximum phase are presented. Dramatic spectroscopic variations were found with a change of most of the lines of singly ionized metals from normal to inverse P Cygni type profiles. Since neither the temperature nor the luminosity of S Dor have changed much, this highly variable flow pattern cannot be explained by radiation pressure variations. In addition, radial velocity variations of a large amplitude of the pseudo-photospheric absorption line Mg II 4481 A were found. It is conjectured that under the conditions of the false photosphere a kappa-mechanism due to hydrogen ionization can drive pulsation like pseudo-photospheric motions giving rise to a highly variable mass flow pattern in the envelope as evidenced by the dramatic variations of the wind lines.
Stahl Otmar
Wolf Bernd
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