THE ORIENTATION OF CIRCUMSTELLAR DISKS AN D THE STATISTICS OF H-ALPHAPROFILES OF AE BE HERBIG STARS/

An analysis of the photo-polarimetric activity of Ae/Be Herbig stars a nd the types of H-alpha profiles observed in their spectra has been ca rried out using data from the literature. This analysis supports the p resence of a relationship between the type of H-alpha profile and the level of photo-polarimetric activity in young stars. Single profiles a nd P Cygni profiles are observed predominantly in stars with low activ ity; two-component profiles (characteristic of an accretion disk) are observed more often in stars with a high level of photometric activity . The existence of a relation of this sort indicates that the various shapes of the observed H-alpha profiles may be explained in the framew ork of a single axially symmetric model with circumstellar gaseous env elopes observed at different angles to the line of sight. A phenomenol ogical model of such envelopes is discussed.