What surface temperature range is characteristic of a blue supergiant like Rigel?

Answer

Exceeding 10,000 Kelvin

The visual color of an expanded star depends on its surface temperature, which is influenced by its initial mass and evolutionary stage. While red giants and red supergiants are cool, typically registering surface temperatures under 5,000 Kelvin, blue supergiants represent the extremely hot end of this spectrum. These massive stars are fusing fuel so rapidly due to intense gravity that they maintain an intense, luminous heat even in their expanded state. Rigel, cited as a classic blue supergiant example, exhibits a surface temperature that can surpass the $10,000$ Kelvin mark, giving it the characteristic blue-white appearance associated with high energy output relative to its cooler, red counterparts.

What surface temperature range is characteristic of a blue supergiant like Rigel?

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