On the CQE Phase Signature Feature in High-Resolution   Spectro-Interferometry of Be Stars
  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. 
D. M. Faes, A. C. Carciofi, Th. Rivinius, S. \v{S}tefl, D. Baade and   A. Domiciano de Souza
astro-ph.SR