Estimation of the mass loss, opening angle and mass of Be circumstellar disks from Br (gamma) continuum emission and interferometric measurements

Using the SIMECA code developed by Stee & Araùjo (1994); Stee et al. (1995) for Be stars we obtain a correlation between the mass loss rates M(dot) and the Br (gamma) continuum luminosity as a function of the opening angle of the disk. We show that this correlation is similar to those obtained by Scuderi et al. (1998) for O-B supergiants. We found that the wind density at the base of the photosphere, from a sample of 8 Be stars, lies between 10^ -13 and 10 ^-12 g cm^ -3. We also present a relationship between the mass of the circumstellar disk and the 2.16 (mu)m flux. Finally we emphasize how interferometric measurements can help to estimate the wind density and we present a sample of 16 Be stars with predicted visibilities that can be observed with the VLTI.