D. M. Faes, A. C. Carciofi, Th. Rivinius, S. Štefl, D. Baade, A. Domiciano de Souza
We analyse a feature that is detectable at the differential phases of high-resolution spectro-interferometry of Be stars. The origin of this feature (dubbed CQE-PS, Central Quasi Emission Phase Signature) lies in the differential absorption of photospheric radiation by the circumstellar disk, which is spectroscopically detected as a CQE line profile in shell stars. This phenomenon has great diagnostic potential for Be star disks, revealing properties of these disks on the scale of a few stellar radii.
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http://arxiv.org/abs/1208.1435
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