An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1 Search : corotation resonance
corotation resonance
  باز‌آوایی ِ هم‌چرخش   
bâzâvâyi-ye ham-carxeš

Fr.: résonance de corotation   

That condition of a → galactic disk at an orbital radius in which the → angular velocity of the disk equals the → pattern speed. It is significant that the spiral wave pattern rotates as a rigid body (ΩP = const), whereas the galactic disk rotates differentially (Ω is a function of galactocentric distance r). The distance rC at which the two angular velocities coincide (Ω(rC) = ΩP) is referred to as the → corotation radius. The corotation resonance and its position within the galaxy is one of the fundamental properties of a spiral galaxy.

corotation; → resonance.