Properties of Circumstellar Envelopes of Be Stars from IR lines.

GRANADA, A.; SABOGAL, B.; CIDALE, L.; MENNICKENT, R.

Praga, Republica Checa.

Congreso; 26 Meeting of the IAU - Solar and Stellar Activity Cycles.; 2006

IAU

We have analyzed the formation of Hydrogen IR emission lines (Brackett, Pfund and Humphreys series) in Be stars on the basis of expanding extended atmosphere models with different temperature laws. We compared our calculated lines with IR spectroscopic observations in the L-band performed in the ESO Observatory Cerro Paranal, Chile. This allowed us to reveal physical characteristics of the circumstellar envelope and test possible departures of radiative equilibrium.