B stars

http://astrothesaurus.org/uat/128

alt label
B type stars
B-type stars
Class B stars
Type-B stars
dcterms modified equal to or less than 2020-10-26T19:00:17.903Zequal to or more than 2020-10-26T19:00:17.903Z
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http://astrothesaurus.org/uat/2051 original
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http://astrothesaurus.org/uat/430 original
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definition A star of spectral type B, whose spectrum is marked by absorption lines of hydrogen; also known as B-type star. B-type optical spectra are characterized by the presence of neutral He lines (mainly He I 4471 Å) at about type B9. He I strengthens up to about B2, then decreases. Ionized helium (mainly He II 4541 Å) first appears at about B0. Most metallic lines are absent or weak, except some absorption lines for the higher ionization states of silicon, oxygen, carbon, and magnesium. These are hot stars with effective temperatures ranging from about 10,000 K at B9 to nearly 30,000 K at B0. They are between 3 and 20 solar masses. Some famous examples include Rigel, Achernar, and Hadar.
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http://astrothesaurus.org/uat/1025 original
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http://astrothesaurus.org/uat/125 original
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128 original
http://astrothesaurus.org/uat/126 original
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128 original
http://astrothesaurus.org/uat/127 original
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128 original
http://astrothesaurus.org/uat/129 original
broader
128 original
http://astrothesaurus.org/uat/130 original
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http://astrothesaurus.org/uat/142 original
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http://astrothesaurus.org/uat/178 original
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http://astrothesaurus.org/uat/189 original
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http://astrothesaurus.org/uat/2 original
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contributor AAS_Frey.Katie original