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The Keenan criterion is the one most commonly used by scientists today; [1] hence it is possible for a supergiant star to have a higher luminosity than a hypergiant of the same spectral class. Hypergiants are expected to have a characteristic broadening and red-shifting of their spectral lines, producing a distinctive spectral shape known as a ...
Hypergiant is an Austin, Texas based technology company, [5] founded in February 2018, [4] and currently headed by CEO Mike Betzer. [ 3 ] [ 6 ] The company develops artificial intelligence (AI) products, [ 7 ] focused on its CommandCenter Platform.
This is a list of the nearest supergiant stars to Earth, located at a distance of up to 1,100 light-years (340 parsecs) from Earth. Some of the brightest stars in the night sky, such as Rigel and Antares, are in the list.
Intrinsic variable types in the Hertzsprung–Russell diagram showing the Yellow Hypergiants above (i.e. more luminous than) the Cepheid instability strip. A yellow hypergiant (YHG) is a massive star with an extended atmosphere, a spectral class from A to K, and, starting with an initial mass of about 20–60 solar masses, has lost as much as half that mass.
6 Cas A has a number of close companions, most notably an 8th magnitude O class bright giant at only 1.5″. Its spectral type is O9.75 and its absolute magnitude is −5.8. [ 12 ] Both are considered to be members of the Cassiopeia OB5 stellar association at a distance of around 8,000 light-years , [ 13 ] along with several other nearby stars ...
Hypergiants (luminosity class 0) are the most luminous and most massive stars known, being several times brighter than even the bright supergiants. Only a few such stars are known in the Milky Way . Wikimedia Commons has media related to Hypergiant stars .
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HD 271182, occasionally referred to as G266 and R92, is a rare yellow hypergiant (YHG) and an Alpha Cygni variable.It is one of the brightest stars in the Large Magellanic Cloud (LMC), [10] positioned in the deep southern constellation of Dorado.