BE STARS - CHROMOSPHERES AND COOL ENVELOPES AND THEIR RELATION TO MAGNETIC-FIELDS

In the present paper we discuss Be stars with nonexpanding cool envelopes observed at large inclination angles. We suggest that high-ionization lines are formed in a chromosphere where the rise in temperature is partly due to dissipation of mechanical energy by braking forces, and that braking forces can be provided by a magnetic field. Further we show how the same magnetic field that characterizes the chromosphere can produce an equatorial envelope (outside the chromosphere) when gravity is counterbalanced by radiation pressure and some particular conditions are fulfilled.