OB star

hot, massive star of spectral types O or early-type B that form in OB associations

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

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.

Like other giant stars they 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.

References change

  • B. Cameron Reed (2003). "Catalog of galactic OB stars". The Astronomical Journal. 125 (5): 2531–2533. Bibcode:2003AJ....125.2531R. doi:10.1086/374771. S2CID 121285799.

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