An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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gray atmosphere
  جّو ِ خاکستری، هواسپهر ِ ~  
javv-e xâkestari, havâsepher-e ~
Fr.: atmosphère grise  

A simplifying assumption in the models of stellar atmosphere, according to which
the absorption coefficient has the same value at all wavelengths.

See also: → gray; → atmosphere.