OB star

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O and B stars are the hottest in the stellar classification. These stars are from the main sequence
LH 72 is one of the OB associations present in the Large Magellanic Cloud.

OB stars are hot, massive blue stars. They are stars of types O or B in the Hertzsprung–Russell diagram.

These stars are short lived, and do not move far from where they were formed. During their lifetime, they emit huge amounts of ultraviolet radiation. This radiation ionizes the surrounding interstellar gas of the nebula, forming an H II region.

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