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 : AB magnitude system
AB magnitude system
  راژمان ِ بُرز ِ BA   
râžmân-e borz-e AB

Fr.: système de magnitudes AB   

A → photometric system defined by reference to → monochromatic magnitudes in such a way that, when monochromatic → flux fν is measured in ergs sec-1 cm-2 Hz-1, the magnitude will be: AB = -2.5 logfν - 48.60. The constant is set so that AB is equal to the V magnitude for a source with a flat → spectral energy distribution. The → zero point is defined by the flux of the star → Vega at 5546 Å. In this system, an object with constant flux per unit frequency interval has zero color.

magnitude; → system.