The sun is white because our eyes perceive light from the sun that way. There is no objective definition of “white” other than what appears as white to us. Aliens who evolved on a planet with a different sun would likely see it as “not white” or tinted either as a color of a shorter wavelength or a longer one.
Consider bulbs labeled “daylight”, “bright white” or “warm white”. These bulbs have light distributions representing the light output from different plasma temperatures. The “warm white” is reddish.
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