Inastronomy, theKraft break refers to the abrupt decrease instars' average rotation rates atsurface temperatures below about 6,200 kelvin. This temperature corresponds tomid-F type stars.[1] The so-calledbreak bears the name ofastronomerRobert Kraft,[2] though its existence was recognized prior to his publications on the topic.[3] The break is understood to separate stars with deep convective envelopes and efficient magnetic dynamos from those without. The dynamos are thought to maintain magnetic fields that transfer angular momentum to the stellar wind, thus slowing down the star's surface throughmagnetic braking. In hot stars the process is less efficient (because the convective envelopes are shallow) so the stars continue to rotate quickly.[4]
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