colour index


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colour index

or

color index

n
1. (Astronomy) astronomy the difference between the apparent magnitude of a star measured in one standard waveband and in a longer standard waveband, indicating its colour and temperature
2. (Geological Science) geology the sum of the dark or coloured minerals of a rock, expressed as a percentage of the total minerals
3. (Chemistry) chem physics a systematic arrangement of colours according to their hue, saturation, and brightness
4. (General Physics) chem physics a systematic arrangement of colours according to their hue, saturation, and brightness
References in periodicals archive ?
07 B--V colour index value, by comparing it to Betelgeuse (of lesser B--V of +1.
Since WEBDA provides the distance modulus [mu] and the colour excess or reddening E(B-V) for each cluster, it is possible to generate HRDs for each cluster by calculating the absolute visual magnitude Mv and the intrinsic colour index [(B-V).
6,7) It should be noted that the V-K colour index indicates a significantly cooler blended temperature than the V-Rc.