The expanding envelope of Tau Scorpii - A detailed UV-line fit

Details The expanding envelope of Tau Scorpii - A detailed UV-line fit The expanding envelope of Tau Scorpii - A detailed UV-line fit

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..169h&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 169-174. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

42

Early Stars, Stellar Atmospheres, Stellar Envelopes, Ultraviolet Spectra, Ionizing Radiation, Resonance Lines, Stellar Winds, Velocity Distribution

Scientific paper

The comoving-frame technique is applied to the UV resonance lines of Tau Sco. A detailed fit is achieved by construction of a simple empirical wind model. The profiles are reproduced over the whole range including the line center regions and the overlapping doubles, because the low-velocity regions and the formation of blends are taken into account correctly. The results confirm that the ionization decreases outwards in the envelope of Tau Sco. On the basis of the 'warm wind model' an electron temperature from 250,000 K to 140,000 K is required for the observed ionization. A high turbulence velocity (100 km/s) is observed even in the low velocity layers.

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