Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..178l&link_type=abstract
Astronomy and Astrophysics, vol. 102, no. 2, Oct. 1981, p. 178-190.
Astronomy and Astrophysics
Astrophysics
19
Main Sequence Stars, Stellar Interiors, Stellar Mass, Stellar Rotation, Stellar Structure, Angular Momentum, Angular Velocity, Atmospheric Composition, Axisymmetric Bodies, Stellar Gravitation, Stellar Luminosity, Stellar Models, Velocity Distribution
Scientific paper
The effects of differential rotation on the internal structures of ZAMS stars of Population II composition are investigated based on models of axisymmetric stars of 0.9 solar mass and homogeneous composition. The structure of the star is calculated for various angular momentum distributions as a function of the total potential representing the sum of the gravitational and rotational potentials. Whereas uniform rotation moves stellar models downward and to the right from the zero-age, zero-rotation main sequence (ZRMS), differential rotation is found to move the models downward and almost parallel to the ZRMS. A moderate amount of rotation is shown to lead to an approximately 0.53 mag decrease in bolometric magnitude, while rapid rotation decreases it by about 1.05 mag, indicating that the stellar mass-luminosity relation is substantially affected by differential rotation. The main-sequence lifetimes of the rotating models are over a factor of three greater than those of nonrotating stars of the same mass, and as much as 30% greater then the lifetimes of nonrotating stars with comparable luminosities. For a given total angular momentum, however, a change in angular momentum distribution is found to have little effect on central pressure, temperature and density or luminosity, although the calculated equatorial velocity depends strongly on the rotation law. Uniform rotation leads to a large distortion of the stellar surface, while differential rotation can produce an extremely distorted central region.
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