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eJAAVSO

Unsolved Problems in the Evolution of Interacting Binary Stars

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Ronald F. Webbink
Department of Astronomy, University of Illinois, 1002 W. Green St., Urbana, IL 61801

Abstract
Common envelope evolution is essential to the formation of short- period binaries with compact components. Conditions for its onset, and estimates of its outcome are summarized. However, applied to the well-known binaries V471 Tauri and T Coronae Borealis, these conditions lead to serious inconsistencies with their observed properties.

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