Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228l.115k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 228, Mar. 15, 1979, p. L115-L118.
Astronomy and Astrophysics
Astrophysics
10
Red Giant Stars, Stellar Mass Ejection, Stellar Rotation, Supergiant Stars, Angular Momentum, Atmospheric Turbulence, Maxwell-Boltzmann Density Function, Silicates, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Models, Wave Propagation
Scientific paper
A general mechanism first proposed by Burke (1969) is applied to red supergiants for determining the spin-down rate and angular-momentum loss of rotating stars. This model relies principally on sporadic mass ejection, which is assumed to be the result of turbulent elements accelerating material in cool supergiant atmospheres. Mass is preferentially expelled in the forward direction of rotation, resulting in a rapid loss of angular momentum on time scales of 10,000 to 1 million years in the supergiant evolutionary phase. Such rotational breaking will occur if the turbulent elements have characteristic sizes a few percent of the stellar radius and rms velocities one-third the escape speed of the star. This model predicts the formation of a cool silicate disk or torus around the star because of the preferred expulsion of material near equatorial regions of the supergiant.
Kafatos Menas
Michalitsianos Andrew G.
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