color index

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Related to Colour indices: Intrinsic color index

color index

n.
The difference in brightness, expressed in magnitudes, between views of a celestial object through two different colored filters. Colors defined this way are often used to indicate surface temperatures of stars, red being cooler than blue.
References in periodicals archive ?
Converting these (V-R) colour indices to effective temperatures using the tables in reference 7, we find that the maximum and minimum effective temperatures of CQ Boo during a pulsation cycle are ~9000K and ~7700K, hence their ratio is ~1.
Particle size distribution of maize flour and colour indices of flour and tuwo
This improved firmware gives the instrument additional colour indices, enhances colour data plots and simplifies the user-interface.