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The Rotation of the Main-Sequence Components of Algol-Type Semi-Detached Eclipsing Binaries*

Published online by Cambridge University Press:  12 April 2016

E.P.J. Van Den Heuvel
E.P.J. Van Den Heuvel*
Affiliation:
Lick Observatory, University of California, Santa Cruz, Calif., U.S.A.

Abstract

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Newly determined rotational velocities of the main-sequence components of 14 Algol-type semi-detached systems and of 2 detached systems are presented. Combination of these data with the existing data on the rotation of the components of semi-detached systems shows that (i) in systems with primaries of spectral type B8 or later and with P<5 days, deviations from synchronism between rotation and revolution are small in 14 out of 15 cases. The average rotational velocity of the primaries in such systems is 75 km/sec, viz. only 40% of the average rotational velocity of single main-sequence stars in the same spectral region: (ii) primaries of spectral type earlier than B8 in systems with short as well as long periods tend to rotate more than twice as fast as one would expect from synchronism. A tentative explanation for these results is presented.

Type
Part III / Stellar Rotation in Binaries, Clusters, and Special Objects. Statistics of Stellar Rotation
Information
International Astronomical Union Colloquium , Volume 4: Stellar Rotation , 1970 , pp. 178 - 186
Copyright
Copyright © Reidel 1970

Footnotes

†

On leave of absence from Sterrewacht Sonnenborgh, Utrecht, The Netherlands, July 1, 1968 – September 1, 1969.

*

Contributions from the Lick Observatory, No. 305.

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