Line formation in expanding atmospheres - The treatment of radiative equilibrium by approximate lambda operators, and its application to Wolf-Rayet stars

Details Line formation in expanding atmospheres - The treatment of radiative equilibrium by approximate lambda operators, and its application to Wolf-Rayet stars Line formation in expanding atmospheres - The treatment of radiative equilibrium by approximate lambda operators, and its application to Wolf-Rayet stars

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..171h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 171-174.

Astronomy and Astrophysics

Astrophysics

32

Line Spectra, Radiative Transfer, Stellar Atmospheres, Wolf-Rayet Stars, Iterative Solution, Newton-Raphson Method, Nonequilibrium Thermodynamics, Expanding Atmospheres, Radiation Transfer, Approximate Lambda Operators, Wolf-Rayet Stars

Scientific paper

The constraint of radiative equilibrium is incorporated into the new, powerful solution technique for non-LTE problems called "iteration with approximate Λ operators". Test calculations for spherically-expanding stellar atmospheres with complex model atoms demonstrate the capability of the method. Two models which are typical for Wolf-Rayet stars (WN subtypes) are compared with previous results based on temperature structures where the radiative equilibrium was only roughly approximated. The differences are not severe; the parameters of WN stars which were obtained from a quantitative analysis of the helium lines are not significantly corrected, when the improved temperature structure is applied.

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