The FU Orionis mechanism

Astronomy and Astrophysics – Astronomy

Scientific paper

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Early Stars, Flare Stars, Radii, Stellar Evolution, Stellar Models, Angular Momentum, Stellar Luminosity, Stellar Magnitude, Stellar Mass, Stellar Mass Ejection, Stellar Rotation, T Tauri Stars, Thermal Instability

Scientific paper

The paper discusses the FU Orionis mechanism which produces a temporary increase in radius by strong transient heating of a thin outer layer of the star. Composite polytropic models show that the observed changes in radius and luminosity can be accounted for, and that the masses of the FU Ori stars are near 1 solar mass. The most plausible heating mechanism is an instability due to a rapid rotation, and it is suggested that the secular instability of a convective rotating star to bar-like deformations is responsible; this will produce shocks, turbulence, and heating of the outermost layers of the star.

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