On the initial distribution and evolution of angular momentum for main sequence stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Angular Momentum, Angular Velocity, Flare Stars, Late Stars, Main Sequence Stars, Star Distribution, Stellar Rotation, Computerized Simulation, Stellar Mass, Stellar Models, Stellar Spectrophotometry

Scientific paper

From published photometric periods for BY Dra type stars, the angular momentum per unit mass (J/M) for a number of these objects has been computed. The compound values of J/M show that the late type main sequence flare stars have high angular velocities and that their distribution of J/M for spectral types later than K0V, as a function of mass, exceeds by several orders of magnitude any possible extrapolation of the same distribution for intermediate masses. A simple model, developed to explain these results is described.

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