TY - JOUR A1 - Hamann, Wolf-Rainer T1 - Wind models and spectral analyses T2 - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The emission-line dominated spectra of Wolf-Rayet stars are formed in expanding layers of their atmosphere, i.e. in their strong stellar wind. Adequate modeling of such spectra has to face a couple of difficulties. Because of the supersonic motion, the radiative transfer is preferably formulated in the co-moving frame. The strong deviations from local thermodynamical equilibrium (LTE) require to solve the equations of statistical equilibrium for the population numbers, accounting for many hundred atomic energy levels and thousands of line transitions. Moreover, millions of lines from iron-group elements must be taken into account for their blanketing effect. Model atmospheres of the described kind can reproduce the observed WR spectra satisfyingly, and have been widely applied for corresponding spectral analyses. Y1 - 2015 UR - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/8774 UR - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-87748 SP - 91 EP - 96 ER -