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Polaris - the current North star is a multiple star system. The main star Alpha Ursae Minoris is a bright or a possible supergiant with a spectral class of F7. So it's a main sequence star. It's...
Generally a blue star is on the main sequence. However, the colour of a star is related to its temperature. It's temperature is related to the mass of the star - the higher the mass (Size) the hotter...