Synchronization in the early-type detached binary stars

With a set of homogeneous and refined rotational velocities, we discuss the synchronism in the “normal” (all the particular stars, such as Ap, Am and Of, are excluded) earlytype detached binaries. Being different from previous statistical studies, the present paper not only investigates the rotational synchronism of each component, but also estimates its age from newstellar evolutionarygrids, and calculates its synchronization time scale with Zahn’s dynamically tidal theory. Significantly, we find that the dynamically tidal synchronizationmechanism is substantially compatible with the observed data from the comparison of the rotational properties of our components with the theoretical predictions.