Published online by Cambridge University Press: 26 May 2016
The recent progress in optical interferometry has made the direct study of the circumstellar matter around Be stars possible. The Hα emission region around γ Cas has been resolved with the I2T (Thom et al. 1986), GI2T (Mourard et al. 1989) and MkIII (Quirrenbach et al. 1993) instruments; the results support the basic picture of a rotating disk-shaped envelope (e.g. Poeckert and Marlborough 1978). Nearly spherical geometries can be ruled out. In this paper, first results from MkIII observations of a small sample of Be stars (see Table I) will be presented.