Willems, B. and Claret, A.
The effect of stellar compressibility and non-resonant dynamic tides on the apsidal-motion rate in close binaries.
Astronomy & Astrophysics, 398(3) pp. 1111–1116.
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The paper is devoted to the analysis of the systematic deviations between the classical formula for the rate of secular apsidal motion in close binaries and the formula established within the framework of the theory of dynamic tides. The basic behaviour is found to be governed by the dependency of the forcing frequencies on the orbital period and the rotational angular velocity, irrespective of the stellar model. For binaries with short orbital periods a good agreement between the classical apsidal-motion formula and the formula established within the framework of the theory of dynamic tides is only possible for certain values of the rotational angular velocity.
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