Posts Tagged ‘spectrometry’

Colour Index

A measure of a star’s colour, which helps astronomers to tell its surface temperature. It is the difference between the magnitude of a star measured in two different areas of the spectrum. The areas are B (blue), V (violet) and U (ultraviolet) regions. The B-V is the most common index used and is close to zero for a white star. It is extremely useful in the classification of stars, it can tell astronomers if the star is a main sequence star, a giant star or a supergiant star.

The intrinsic colour index is a modified form that has been corrected for interstellar extinction.

 

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