Abstract
In Chapter II of this volume we outlined the methods for determination of the equilibrium form of the components of close binary systems in any external field of force; and in sections II-1 and 2 of Chapter III we set up equations which govern the time-response of such configurations to an arbitrary type of disturbance. The nature of such disturbances may be connected with fluctuations in external gravitational field — such as those causing forced oscillations (dynamical tides) discussed in sections III-2 and 3 — or may arise from evolutionary changes in structure of the respective stars. These may be slow or abrupt (such as the onset of a nuclear reaction in the interior, or of the ionization of hydrogen or helium in the outer layers); and the configuration must respond to them on an appropriate time-scale.
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