Statistics – Computation
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..718m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 2, p. 718-732
Statistics
Computation
14
B Stars, Main Sequence Stars, Massive Stars, Stellar Evolution, Stellar Magnetic Fields, Stellar Models, Stellar Rotation, Wolf-Rayet Stars, Angular Momentum, Field Strength, Kinematics, Mathematical Models, Stellar Winds
Scientific paper
The wind phenomena of a variety of early-type stars, including the evolved B(e) and Wolf-Rayet (W-R) stars, have been explained using the presence of rotation and magnetic fields. However, if a star had a significant wind throughout its previous evolutionary lifetime, spin-down would have occurred. This paper is a first step in an exploration of possible evolutionary scenarios of rotation in massive stars with continuous winds, from zero-age main sequence (ZAMS) through terminal W-R stage. Magnetic fields with varying strengths are considered. A kinematic approach is developed to derive equations for the evolution of angular momentum. The equations are applied to heuristic models that represent single stars with a ZAMS mass of 60 solar mass. Computations are performed for models with different internal angular velocity distributions. Omnidirectional and two-component winds are considered, and, in some models, allowance is made for possible bipolar mass ejection at the Humphreys-Davidson (HD) limit. The effects of the important factors that govern the evolution of the equatorial rotation are discussed.
Cassinelli Joseph
Maheswaran Murugesapillai
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