An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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spectral variability
  ورتندگی ِ بینابی  
vartandegi-ye binâbi
Fr.: variabilité spectrale  

The state of a spectrum from an astronomical object in which the lines change with time as far as their intensity, profile, and wavelength are concerned.

See also: → spectral; → variability.