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Astron. Astrophys. 321, 202-206 (1997)

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Synchronization in the early-type detached binary stars

Kai-ke Pan

Yunnan Observatory and United Optical Lab., Chinses Academy of Sciences, Kunming, 650011, People's Republic of China

Received 24 January 1996 / Accepted 27 August 1996


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) early-type 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 new stellar evolutionary grids, and calculates its synchronization time scale with Zahn's dynamically tidal theory. Significantly, we find that the dynamically tidal synchronization mechanism is substantially compatible with the observed data from the comparison of the rotational properties of our components with the theoretical predictions.

Key words: binaries: close – eclipsing – stars: rotation

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998