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Title:
The evolution of rotating stars. I - Method and exploratory calculations for a 7-solar-mass star
Authors:
Endal, A. S.; Sofia, S.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Optical Astronomy, Greenbelt, Md.)
Publication:
Astrophysical Journal, vol. 210, Nov. 15, 1976, pt. 1, p. 184-198. (ApJ Homepage)
Publication Date:
11/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ANGULAR MOMENTUM, MAIN SEQUENCE STARS, MOMENTUM TRANSFER, STELLAR EVOLUTION, STELLAR MODELS, STELLAR ROTATION, ANGULAR DISTRIBUTION, APPROXIMATION, HERTZSPRUNG-RUSSELL DIAGRAM, MASS DISTRIBUTION, STELLAR MASS, STELLAR STRUCTURE, VELOCITY DISTRIBUTION
Comment:
A&AA ID. AAA018.065.080
DOI:
10.1086/154817
Bibliographic Code:
1976ApJ...210..184E

Abstract

A method is developed which allows the evolution of rotating stars to be studied well beyond the main-sequence stage. Four different cases of redistribution of angular momentum in an evolving star are considered. Evolutionary sequences for a 7-solar-mass star, rotating according to these different cases, were computed from the zero-age main-sequence to the double-shell-source stage. Each sequence was begun with a (typical) equatorial rotational velocity of 210 km/s. On the main sequence, the effects of rotation are of minor importance. However, as the core contracts during later stages, important effects arise in all physically plausible cases. The outer regions of the cores approach critical velocities and develop unstable angular-velocity distributions. The effects of these instabilities should significantly alter the subsequent evolution.

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