Unified NLTE model atmospheres including spherical extension and stellar winds, 4: Improved line transfer and wind contamination of H, He profiles

Details Unified NLTE model atmospheres including spherical extension and stellar winds, 4: Improved line transfer and wind contamination of H, He profiles Unified NLTE model atmospheres including spherical extension and stellar winds, 4: Improved line transfer and wind contamination of H, He profiles

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992agab....7..124s&link_type=abstract

Astronomische Gesellschaft Abstract Series, No. 7, p. 124

Other

H Lines, Line Spectra, Stellar Atmospheres, Stellar Winds, Emission Spectra, Lyman Spectra, Spectrum Analysis, Thermodynamic Equilibrium, Velocity Distribution

Scientific paper

The treatment of NLTE (Nonlocal Thermodynamic Equilibrium) multilevel radiative transfer in the presence ofand supersonic velocity fields of unified model atmospheres is discussed. The solution of the line transfer in the comoving frame is obtained via accelerated lambda iteration. This method yields excellent convergence also in cases, where many strong, intermediate and weak lines have to be treated simultaneously and where other operators failed to achieve convergencve. This algorithm is used to investigate the contamination of photospheric hydrogen and helium absorption lines by emission of the stellar wind. It is found that in the case of early O-supergiants close to the Eddington-limit wind contamination is significant and leads to systematic errors in the determination of stellar parameters, if purely hydrostatic, plane parallel NLTE models are used for the spectral analysis. A specific behavior of the mean line intensity, namely a local minimum around the sonic point, is discussed.

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