Analyses of ultraviolet resonance line profiles and H alpha profiles for the possible existence of coronas in O stars

Physics

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High Temperature, Line Spectra, O Stars, Optical Resonance, Coronas, Radial Velocity, Stellar Winds, Ultraviolet Spectra

Scientific paper

The thesis analyzes line profiles originating in the winds of O stars in two different spectral regions to test for the existence of high temperature regions in these winds. Therefore the first part of this work considers ultraviolet resonance lines and the second considers H alpha emission. The ultraviolet resonance lines of zeta Puppis are analyzed with a line fitting technique that determines the degree of ionization and radial dependence of the ionization in the stellar winds. Families of line profiles are calculated with the Sobolev approximation of line transfer and are presented with scaling laws to extend their applicability to any resonance line in any star. The second approach studied the H alpha line in zeta Orionis and zeta Pup. These lines are also analyzed by the Sobolev approximation for line transfer.

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