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Stellar differential rotationScienceDaily
•77% Informative
Astronomers from the University of Helsinki have found that the rotational profile of a nearby star, V889 Herculis , differs considerably from that of the Sun .
The Sun rotates the fastest at the equator, whereas the rotation rate slows down at higher latitudes and is the slowest as the polar regions.
The observation provides insights into the fundamental stellar astrophysics.
The stars were selected as targets because they have been observed for decades .
They both rotate very rapidly, with rotation periods of only about one and half days .
For this reason, long-baseline brightness observations contain many rotational cycles.
The stars have both been studied actively at the University of Helsinki .
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