Why do stars with emission peaks in the violet/purple range not appear distinctly purple to an observer?
Answer
The sheer intensity of the associated blue and ultraviolet output dominates the visual perception.
Even if the peak emission is in the violet range, stars that hot also radiate enormous amounts of energy in the blue and UV bands. This powerful blue output overwhelms the violet component, causing the eye to perceive the star as blue or blue-white.
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