Abstract
Abstract During seven years of photopolarimetric monitoring of Herbig Ae star WW Vul 4 deep (Δm > 2 mag) brightness minima were observed. During each of them the degree of linear polarization increased up to 6%. Such a dependence of observed polarization on stellar magnitude agrees well with the now accepted model of variable circumstellar screening. During 1994–1995 WW Vul shown unusual variability of brightness and linear polarization: a change of positional angle of almost 90° with insignificant changes of polarization degree and brightness. Our analysis shows that this behaviour can be explained within the framework of the model mentioned above. It is assumed that part of the polarized radiation arises from scattering on dense circumstellar dust clouds moving close to the star without crossing the line of sight.
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