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rotational velocity - translation to german
![This illustration shows the oblate appearance of the star [[Achernar]] caused by rapid rotation.](https://commons.wikimedia.org/wiki/Special:FilePath/Achernar.svg?width=200 "This illustration shows the oblate appearance of the star [[Achernar]] caused by rapid rotation.")
Definition
Wikipedia
Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the movements of active features on the surface.
The rotation of a star produces an equatorial bulge due to centrifugal force. As stars are not solid bodies, they can also undergo differential rotation. Thus the equator of the star can rotate at a different angular velocity than the higher latitudes. These differences in the rate of rotation within a star may have a significant role in the generation of a stellar magnetic field.
The magnetic field of a star interacts with the stellar wind. As the wind moves away from the star its rate of angular velocity slows. The magnetic field of the star interacts with the wind, which applies a drag to the stellar rotation. As a result, angular momentum is transferred from the star to the wind, and over time this gradually slows the star's rate of rotation.
