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Slightly cooler than class A, yellow-white stars with surface temperatures of 6,000 to 7,500 K. Examples: Canopus, Procyon.

Very luminous and blue-white, surface temperatures between 10,000 K and 30,000 K. Examples: Rigel, Spica.

Cool, orange stars with surface temperatures between 3,700 to 5,200 K. Examples: Arcturus, Aldebaran.

Hottest and brightest main sequence stars, blue in color, with surface temperatures exceeding 30,000 K. Examples: Zeta Puppis, Alnitak.

Similar to the Sun, these stars are yellowish with surface temperatures between 5,200 to 6,000 K. Examples: The Sun, Alpha Centauri A.

The coolest main sequence stars, red in color with surface temperatures less than 3,700 K. Examples: Proxima Centauri, Betelgeuse.