On the properties of stellar winds in hot stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, B Stars, Hot Stars, O Stars, Stellar Winds, Ultraviolet Spectroscopy, Iue, Oao 3, Plasma Temperature, Satellite Observation, Stellar Coronas, Stellar Luminosity, Td-1 Satellite

Scientific paper

The asymmetric UV profiles of 14 OB (from IUE, Copernicus, and TD-1 satellite observations) stars are analyzed in terms of a warm-wind (Te = 100,000 K) model and a corona/cool-wind model of stellar-wind generation. Stars with T(eff)s near 13,000 K and in the range 20,000-25,000 K are shown to have significant drops in the matter temperature of their winds in either model. While the first drop is found to be the same as that identified by Rosendahl (1973), the second is attributed to a change in wind-production mechanism associated with a region of complete He ionization.

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