Modeling of rapid variability in the spectral line profiles of Wolf-Rayet stars

Profiles of variable emission lines in the spectra of Wolf-Rayet stars are calculated using a stochastic cloud model for the inhomogeneous atmospheres of early-type stars. The model assumes that most of the line flux is forme d in cold, dense condensations (clouds) that move through a rarified inter- cloud medium whose density monotonically decreases outwards. The formation of clouds is taken to be stochastic. Wavelet analysis is used to estimate t he parameters of cloud ensembles. The model can reproduce the general patte rn of line-profile variability observed in the spectra of Wolf-Rayet stars. (C) 2001 MAIK "Nauka/Interperiodica".