On the rotation of B and Be stars

Physics

Scientific paper

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Angular Momentum, B Stars, Early Stars, Stellar Rotation, Variable Stars, Balmer Series, Limb Darkening, Stellar Evolution, Stellar Models

Scientific paper

Models of rigidly rotating B and Be stars are discussed, and results for 5-solar-mass rotating stars both on the ZAMS and in a hydrogen burning shell phase are presented. It is shown that, as a consequence of the gravitational darkening effect, the rotating stars have more evolved spectral types than their homologous nonrotating counterparts. Results indicate that the observed velocity to critical equatorial velocity ratios of Be stars can never correspond to critical rigid-body rotation. The variation of angular momentum of B and Be stars during their evolution is also considered.

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