Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..993h&link_type=abstract
Astronomy and Astrophysics, v.410, p.993-1000 (2003)
Astronomy and Astrophysics
Astrophysics
17
Stars: Winds, Outflows, Stars: Mass-Loss, Stars: Wolf-Rayet, Radiative Transfer, Stars: Atmospheres
Scientific paper
Model atmospheres form the basis for the interpretation of stellar spectra. A major problem in those model calculations is to establish the temperature stratification from the condition of radiative equilibrium. Dealing with non-LTE models for spherically expanding atmospheres of Wolf-Rayet stars, we developed a new temperature correction method. Its basic idea dates back to 1955 when it was proposed by Unsöld for grey, static and plane-parallel atmospheres in LTE. The equations were later generalized to the non-grey case by Lucy. In the present paper we furthermore drop the Eddington approximation, proceed to spherical geometry and allow for expansion of the atmosphere. Finally the concept of an ``approximate lambda operator'' is employed to speed up the convergence. Tests for Wolf-Rayet type models demonstrate that the method works fine even in situations of strong non-LTE.
Gräfener Goetz
Hamann Wolf-Rainer
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