calcium break index — An Etymological Dictionary of Astronomy and Astrophysics

calcium break index

دیشن ِ گسست ِ کلسیوم

dišan-e gosast-e kalsiom

Fr.: indice de la coupure de calcium

The strength of the → calcium break, as measured from the fluxes in the intervals 3750-3950 Å and 4050-4250 Å. It is given by the expression Ca-break[%] = 100 · (f_upper - f_lower)/f_upper,
where f_upper and f_lower are the mean fluxes measured in the 3750-3950 Å and 4050-4250 Å bands, respectively,
in the rest frame
(Dressler & Shectman 1987, AJ 94, 899).

See also: → calcium; → break; → index.

An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک