Radiative transfer in moving media
II. Solution of the radiative transfer equation in axial symmetry
Astronomický Ústav, Akademie Věd České Republiky, 251 65 Ondřejov, Czech Republic e-mail: email@example.com
Accepted: 30 April 2005
A new method for the formal solution of the 2D radiative transfer equation in axial symmetry in the presence of arbitrary velocity fields is presented. The combination of long and short characteristics methods is used to solve the radiative transfer equation. We include the velocity field in detail using the Local Lorentz Transformation. This allows us to obtain a significantly better description of the photospheric region, where the gradient of the global velocity is too small for the Sobolev approximation to be valid. Sample test calculations for the case of a stellar wind and a rotating atmosphere are presented.
Key words: radiative transfer / line: formation / line: profiles
© ESO, 2005