Program: GN-2010B-SV-157

Our aim is to study the underlying mechanism originating the B[e] phenomenon and investigate the geometry, physical structure and evolution of the circumstellar envelope of B[e] supergiants. In this context, high quality IR data are very important to test models of stellar winds and set constraints to the circumstellar material. Determinations of fundamental parameters, mass loss rates and velocity fields, on the basis of line profile fittings, will allow us to investigate the mechanisms taking part in the disk formation and the wind momentum luminosity (WM-L) relationship of these peculiar objects. Furthermore, reliable mass loss rate estimates are of vital importance as input of modern stellar evolution codes, which still lack capable reproductions of final evolutionary phases of massive stars