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The models for Epsilon Aurigae proposed by different observers differ in detail, but all tend to agree on the sliding brick model: The eclipsing body is more than a secondary star; it must somehow include at least one oblong cloud of obscuring matter.
Backman of the University of Hawaii at Manoa in Honolulu, reporting on infrared observations at Mauna Kea and Kitt Peak (Ariz.) National Observatory and with the Infrared Astronomy Satellite (IRAS), considers the eclipsing object to be a dark cloud with a binary star embedded in it.
The hot spot seems to be in the center of the eclipsing body, which then would be a hot source surrounded by a cool region or cloud.