Polarization in the envelope of active hot stars

The flattening of the circumstellar envelope produces a global polarization of the envelope of a few percent. We have try to observe with the GI2T this polarization effect in γ Cas. If you are
interested in our results please see: Rousselet-Perraut, K., Vakili, F., Mourard, D., Morand, F., Bonneau, D. and Stee Ph. 1997, "An attempt to detect polarization effects in the envelope of γ Cas with the GI2T
A&A suppl., 123, 173.