The angular momentum loss of rapidly rotating late-type main sequence binaries

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Angular Momentum, Binary Stars, G Stars, Late Stars, Main Sequence Stars, Stellar Rotation, Angular Velocity, Star Formation, Stellar Activity, Stellar Evolution, Stellar Mass

Scientific paper

Magnetic activity generated in the convective zone is at the origin of angular momentum loss of late type stars, and is generally accepted as the explanation for the decay of rotation observed in these stars. The angular momentum loss can be expressed as a power law of the angular velocity whose validity is established for equatorial velocities up to 40 km/s. Synchronized late-type binaries losing angular momentum will evolve toward smaller orbits and, hence, toward increasing angular velocities of the components, by virtue of the coupling between spin and orbital momentum. This effect is used to explain the bimodal character of the period distribution of close G type binaries. It is also possible to derive a new power law for the loss of angular momentum of these very rapidly rotating (up to 200 km/s) tidally coupled binary components.

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