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On the Onset of Contact in Early-Type Binaries

Published online by Cambridge University Press:  14 August 2015

R. F. Webbink
R. F. Webbink*
Affiliation:
University of Illinois

Abstract

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A previously published model of a detached binary evolving into deep contact, under the assumption that both components fill the same equipotential surface, is tested for self-consistency. Hydrodynamic equations describing the flow between components at their interface indicate an enormous discrepancy in the magnitude and direction of the flow in the evolutionary calculation. This behavior strongly supports the view that binaries reaching contact in this way undergo a cyclic thermal instability as in many models of W Ursae Majoris systems, rather than overflowing an outer Lagrangian point.

Type
III. Mass Transfer and Mass Loss - Theory
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 127 - 132
Copyright
Copyright © Reidel 1980 

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