Blue supergiant - Simple English Wikipedia, the free encyclopedia

A blue supergiant (BSG) is a hot, luminous star, also called an OB supergiant. They are usually thought to be those with luminosity class I and spectral class B9 or earlier,^[1] although sometimes A-class supergiants are also called blue supergiants.^[2][3][4]

They are bigger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun. They might form when two stars merge together.^[5][6]

• Red supergiant
• Supergiant
• Luminosity