Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160..347h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 2, May 1986, p. 347-351.
Astronomy and Astrophysics
Astrophysics
55
Line Spectra, Radiative Transfer, Stellar Atmospheres, Stellar Spectra, Wolf-Rayet Stars, Eddington Approximation, Expansion, Helium, Hydrogen, Iterative Solution
Scientific paper
The multilevel non-LTE spectral formation in spherically expanding atmospheres is calculated by means of a perturbation technique. The present method uses approximate lambda operators which act only locally. Adequate operators are taken for continua and lines, the latter being constructed from the viewpoint of the comoving frame. One obtains modified, nonlinear equations for the statistical equilibrium, which are solved by linearization. Due to this method, only 'formal solutions' of the accurate radiation transfer are required, and are performed by means of the comoving frame technique. Test calculations are presented for a typical Wolf-Rayet star atmosphere of pure helium, accounting for 12 atomic levels and 45 He II lines. Satisfactory convergence is demonstrated. The method seems to be capable for handling additionally He I and CNO as complex ions.
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