B-type main-sequence star

<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>A B-type main-sequence star is a <a href="/facts/Main_sequence/DJ3Wq8kd">main-sequence</a> (<a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>-burning) <a href="/facts/Star/euBFuo07">star</a> of <a href="/facts/Stellar_classification/dYrIuK9H">spectral type B</a>. The spectral <a href="/facts/Luminosity_class/dYrIuK9H">luminosity class</a> is typically V. These stars have from 2 to 18 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 about 10,000 and 30,000 <a href="/facts/Kelvin/E3trzC4C">K</a>.
</p><p>B-type stars are extremely luminous and blue. Their spectra have strong neutral <a href="/facts/Helium/yRul93TG">helium</a> <a href="/facts/Absorption_line/HuI4Bj5f">absorption lines</a>, which are most prominent at the B2 subclass, and moderately strong hydrogen lines. Examples include <a href="/facts/Regulus/3Dw39x28">Regulus</a>, <a href="/facts/Algol_A/mw03yQdn">Algol A</a> and <a href="/facts/Acrux/b5w2qew4">Acrux</a>.
</p>

B-type main-sequence star open-in-new

B-type main-sequence star