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O-type main-sequence star
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<a href="/facts/Hertzsprung%25E2%2580%2593Russell_diagram/53YWnCvR">Hertzsprung–Russell diagram</a> <a href="/facts/Stellar_classification/dYrIuK9H">Spectral type</a> <a href="/facts/O-class_star/dYrIuK9H">O</a> <a href="/facts/B-class_star/dYrIuK9H">B</a> <a href="/facts/A-class_star/dYrIuK9H">A</a> <a href="/facts/F-class_star/dYrIuK9H">F</a> <a href="/facts/G-class_star/dYrIuK9H">G</a> <a href="/facts/K-class_star/dYrIuK9H">K</a> <a href="/facts/M-class_star/dYrIuK9H">M</a> <a href="/facts/L-class_star/fa7kr9lH">L</a> <a href="/facts/T-class_star/BxLocDRU">T</a> <a href="/facts/Brown_dwarf/fa7kr9lH">Brown dwarfs</a> <a href="/facts/White_dwarf/gIYlTtrC">White dwarfs</a> <a href="/facts/Red_dwarf/56CMQcF0">Red dwarfs</a> <a href="/facts/Subdwarf/5h8hyTHM">Subdwarfs</a> <a href="/facts/Main_sequence/DJ3Wq8kd">Main sequence("dwarfs")</a> <a href="/facts/Subgiant/wD7o7E2Q">Subgiants</a> <a href="/facts/Giant_star/kMseY7qf">Giants</a> <a href="/facts/Red_giant/lla6Bsvy">Red giants</a> <a href="/facts/Blue_giant/JPjptPb7">Blue giants</a> <a href="/facts/Bright_giant/qH3X0fuw">Bright giants</a> <a href="/facts/Supergiant_star/y7w8WEcm">Supergiants</a> <a href="/facts/Red_supergiant/hPBWvABE">Red supergiant</a> <a href="/facts/Hypergiant/Q95EmMhT">Hypergiants</a> <a href="/facts/Absolute_magnitude/R8RVxkLx">absolutemagni-tude(MV)</a> <p>An O-type main-sequence star is a <a href="/facts/Main_sequence/DJ3Wq8kd">main-sequence</a>—core <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>-burning—<a href="/facts/Star/euBFuo07">star</a> of <a href="/facts/Spectral_classification/dYrIuK9H">spectral type</a> O. The spectral <a href="/facts/Luminosity_class/dYrIuK9H">luminosity class</a> is typically V although class O main sequence stars often have spectral peculiarities due to their extreme luminosity. These stars have between 15 and 90 times the <a href="/facts/Solar_mass/j6Auhku8">mass</a> of the <a href="/facts/Sun/CadPCVHh">Sun</a> and <a href="/facts/Effective_temperature/RY30DaSY">surface temperatures</a> between 30,000 and 50,000 <a href="/facts/Kelvin/E3trzC4C">K</a>. They are between 40,000 and 1,000,000 times as <a href="/facts/Solar_luminosity/CLG0r9bP">luminous as the Sun</a>. </p>