Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190..321l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 190, Feb. 1980, p. 321-335.
Astronomy and Astrophysics
Astronomy
40
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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