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Synchronization in late-type binary stars
The synchronism between rotation and revolution in late-type closebinaries is rediscussed by an inspection of the published rotationvelocities and rotation (photometric) periods of about 50 binarycomponents. Basically, it is found that, as a rule, dwarfs havingfractional radii of more than 0.05 appear to be in synchronous rotationand those with radii of less than 0.03 are in asynchronous rotation;asynchronism is more frequently observed in giants. Remarkably, theobserved degree of synchronism appears to be in substantial agreementwith current theoretical views (Zahn, 1977) on tidal friction inlate-type binaries.
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