14 research outputs found
The evolution of rotating stars
First, we review the main physical effects to be considered in the building
of evolutionary models of rotating stars on the Upper Main-Sequence (MS). The
internal rotation law evolves as a result of contraction and expansion,
meridional circulation, diffusion processes and mass loss. In turn,
differential rotation and mixing exert a feedback on circulation and diffusion,
so that a consistent treatment is necessary.
We review recent results on the evolution of internal rotation and the
surface rotational velocities for stars on the Upper MS, for red giants,
supergiants and W-R stars. A fast rotation is enhancing the mass loss by
stellar winds and reciprocally high mass loss is removing a lot of angular
momentum. The problem of the ``break-up'' or -limit is critically
examined in connection with the origin of Be and LBV stars. The effects of
rotation on the tracks in the HR diagram, the lifetimes, the isochrones, the
blue to red supergiant ratios, the formation of W-R stars, the chemical
abundances in massive stars as well as in red giants and AGB stars, are
reviewed in relation to recent observations for stars in the Galaxy and
Magellanic Clouds. The effects of rotation on the final stages and on the
chemical yields are examined, as well as the constraints placed by the periods
of pulsars. On the whole, this review points out that stellar evolution is not
only a function of mass M and metallicity Z, but of angular velocity
as well.Comment: 78 pages, 7 figures, review for Annual Review of Astronomy and
Astrophysics, vol. 38 (2000
Are breast conservation and mastectomy equally effective in the treatment of young women with early breast cancer? Long-term results of a population-based cohort of 1,451 patients aged ≤40 years
Effectiveness of the serious game ‘You & I’ in changing mentalizing abilities of adults with mild to borderline intellectual disabilities: a parallel superiority randomized controlled trial
Adaptive Plasticity in the Hippocampus of Young Mice Intermittently Exposed to MDMA Could Be the Origin of Memory Deficits
Recycling technologies
Recycling Technologies: Paper Fiber
Waste Paper Characteristics
Waste Paper Recycling Technologies
Recycling Technologies: Glass
Cullet Contaminants
Cullet Recycling Technologies
Recycling Technologies: Metals
Ferrous Metals
Ferrous Metal Recycling Technologies
Nonferrous Metals
Nonferrous Metal Recycling Technologies
Recycling Technologies: Plastics
Waste Plastic Sources and Characteristics
Waste Plastic Recycling Technologies
Recycling Technologies: Fibers (Textiles and Carpets)
Textiles
Textiles Recycling Technologies
Carpets
Carpet Recycling Technologies
Future Directions: Innovative Control/Sorting
Devices/Logics Integration in Recycling Plant