A Bagel-shaped Envelope To Model Circumstellar Material Around Rapidly Rotating Be-type Stars

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The circumstellar material around Be stars have essentially been studied spectroscopically and interferometrically with disc-shaped models (Waters et al. 1987, Hummel 1994, Gies et al. 2007), where the physical properties are still not very well defined. Schmitz et al. 1983 and Rohrmann et al. 1997, have applied the kinetic theory of
gases to steady-state isothermal gaseous masses with differential rotation, and predict bagel-shaped circumstellar envelopes. The theory of a circumstellar torus could very well explain the short and long lived photometric outbursts that have been reported by Mennickent
et al.2002, Hubert et al. 1998, and other irregular behaviors such as the spectroscopic transition from a standard B-type star to a Be-type star (Pavlovski et al. 1997). The purpose of this study is to show results on how to model
a low-density circumstellar torus around the Be star and to generate visibility curves that could be comparable to observational data obtained with the CHARA long baseline infrared interferometer.

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