An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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calcium break
  گسست ِ کلسیوم  
gosast-e kalsiom
Fr.: coupure de calcium  

A discontinuity in the spectrum of galaxies near the Ca II → H and K lines at about 4000 Å. The Ca break
is the most prominent feature in the spectra of elliptical galaxies. Its strength is given by the → calcium break index.

See also: → calcium; → break.