Are Rotational Axes Perpendicular to Orbital Planes in Binary Systems. III.Main Sequence and Short-Period RS CVn Stars.

Astronomy and Astrophysics – Astronomy

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Stars: Rotation-Binaries: General-Stars: Late-Type

Scientific paper

Inclinations of the rotational axes, irot, are determined for 46 main sequence binaries of F, G, K and M spectral type and short period RS CVn systems. Seven binaries are asynchronous. The inclinations irot are then compared with the orbital inclinations, iorb, to test the alignment between the equatorial and orbital planes. In all 39 cases of synchronous rotators irot is equal or nearly equal to iorb. In a sample of seven asynchronous systems, at least six, and perhaps all, are non-coplanar.

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