Which H-R diagram region hosts cool, red stars like Betelgeuse that exhibit high total luminosity?
Answer
Upper-right
Stars appearing in the upper-right section of the H-R diagram are characterized by having low surface temperatures, meaning they appear red. To maintain a high total luminosity despite this relatively low energy output per square unit of surface, these stars must possess an enormous surface area. This region is populated by the giants and supergiants, which are expanded stars whose physical radii are vastly larger than main-sequence stars, sometimes extending past orbits like that of Mars.
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