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- Hypergiant abstract "A hypergiant (luminosity class 0 or Ia+) is a star with an enormous luminosity showing signs of a very high rate of mass loss.The word "hypergiant" is commonly used as a loose term for the most luminous stars found, even though there are more precise definitions. In 1956, the astronomers Feast and Thackeray used the term super-supergiant (later changed into hypergiant) for stars with an absolute magnitude brighter than MV = −7 (MBol will be larger for very cool and very hot stars, for example at least −9.7 for a B0 hypergiant). In 1971, Keenan suggested that the term would be used only for supergiants showing at least one broad emission component in Hα, indicating an extended stellar atmosphere or a relatively large mass loss rate. The Keenan criterion is the one most commonly used by scientists today. Additionally, hypergiants are expected to have characteristic broadening and red-shifting of their spectral lines producing a distinctive shape known as a P Cygni profile. The use of hydrogen emission is not helpful for defining the coolest hypergiants, and these are largely classified on luminosity since mass loss is almost inevitable for the class.Many astronomers do not use the term hypergiant, except occasionally for specific well-defined groups such as the yellow hypergiants, so it is common to see the term RSG (red supergiant) or B(e) supergiant (blue supergiant with emission spectra) being used to refer to stars that this article defines as hypergiants. There is an MKK luminosity class 0 (zero) for hypergiants, but this is rarely seen in published spectral classifications. More commonly, hypergiants will be classed as Ia-0, Ia+, or even just Iae based solely on the observed spectra. As noted, red supergiants rarely receive these extra spectral classifications. Initial observation of a highly luminous star is insufficient for it to be defined as a hypergiant. That requires the detection of the spectral signatures of atmospheric instability and high mass loss. So it is quite possible for non-hypergiant supergiant stars to have the same or higher luminosity as a hypergiant of the same spectral class.".
- Hypergiant thumbnail Rho_Cassiopeiae_Sol_VY_Canis_Majoris.png?width=300.
- Hypergiant wikiPageID "21244416".
- Hypergiant wikiPageLength "26644".
- Hypergiant wikiPageOutDegree "118".
- Hypergiant wikiPageRevisionID "683163725".
- Hypergiant wikiPageWikiLink A._David_Thackeray.
- Hypergiant wikiPageWikiLink AS_314.
- Hypergiant wikiPageWikiLink A_David_Thackeray.
- Hypergiant wikiPageWikiLink Absolute_magnitude.
- Hypergiant wikiPageWikiLink Aquila_(constellation).
- Hypergiant wikiPageWikiLink Atom.
- Hypergiant wikiPageWikiLink Atoms.
- Hypergiant wikiPageWikiLink BP_Crucis.
- Hypergiant wikiPageWikiLink Big_Bang.
- Hypergiant wikiPageWikiLink Carina_(constellation).
- Hypergiant wikiPageWikiLink Carina_Nebula.
- Hypergiant wikiPageWikiLink Cassiopeia_(constellation).
- Hypergiant wikiPageWikiLink Category:Hypergiants.
- Hypergiant wikiPageWikiLink Category:Star_types.
- Hypergiant wikiPageWikiLink Category:Stellar_phenomena.
- Hypergiant wikiPageWikiLink Cl*_1806-20.
- Hypergiant wikiPageWikiLink Convection.
- Hypergiant wikiPageWikiLink Cygnus_(constellation).
- Hypergiant wikiPageWikiLink Cygnus_OB2-12.
- Hypergiant wikiPageWikiLink Dorado.
- Hypergiant wikiPageWikiLink Dorado_(constellation).
- Hypergiant wikiPageWikiLink Eddington_limit.
- Hypergiant wikiPageWikiLink Eddington_luminosity.
- Hypergiant wikiPageWikiLink Eta_Carinae.
- Hypergiant wikiPageWikiLink Galaxy.
- Hypergiant wikiPageWikiLink H-alpha.
- Hypergiant wikiPageWikiLink HDE_268835.
- Hypergiant wikiPageWikiLink HDE_269128.
- Hypergiant wikiPageWikiLink HD_160529.
- Hypergiant wikiPageWikiLink HD_168607.
- Hypergiant wikiPageWikiLink HD_168625.
- Hypergiant wikiPageWikiLink HD_179821.
- Hypergiant wikiPageWikiLink HD_268757.
- Hypergiant wikiPageWikiLink HD_269604.
- Hypergiant wikiPageWikiLink HD_269661.
- Hypergiant wikiPageWikiLink HD_269700.
- Hypergiant wikiPageWikiLink HD_269781.
- Hypergiant wikiPageWikiLink HD_32034.
- Hypergiant wikiPageWikiLink HD_33579.
- Hypergiant wikiPageWikiLink HD_37974.
- Hypergiant wikiPageWikiLink HD_6884.
- Hypergiant wikiPageWikiLink HD_7583.
- Hypergiant wikiPageWikiLink HD_80077.
- Hypergiant wikiPageWikiLink HR_5171.
- Hypergiant wikiPageWikiLink HR_diagram.
- Hypergiant wikiPageWikiLink HT_Sagittae.
- Hypergiant wikiPageWikiLink Heat_convection.
- Hypergiant wikiPageWikiLink Helium.
- Hypergiant wikiPageWikiLink Hertzsprung–Russell_diagram.
- Hypergiant wikiPageWikiLink Hydrogen.
- Hypergiant wikiPageWikiLink Hypernova.
- Hypergiant wikiPageWikiLink IRAS_17163-3907.
- Hypergiant wikiPageWikiLink IRAS_18357-0604.
- Hypergiant wikiPageWikiLink IRC+10420.
- Hypergiant wikiPageWikiLink LBV_1806-20.
- Hypergiant wikiPageWikiLink Large_Magellanic_Cloud.
- Hypergiant wikiPageWikiLink List_of_most_massive_known_stars.
- Hypergiant wikiPageWikiLink List_of_most_massive_stars_known.
- Hypergiant wikiPageWikiLink Luminosity.
- Hypergiant wikiPageWikiLink Luminous_blue_variable.
- Hypergiant wikiPageWikiLink Metallicity.
- Hypergiant wikiPageWikiLink NGC_3372.
- Hypergiant wikiPageWikiLink NML_Cygni.
- Hypergiant wikiPageWikiLink OB_association.
- Hypergiant wikiPageWikiLink P_Cygni.
- Hypergiant wikiPageWikiLink Photosphere.
- Hypergiant wikiPageWikiLink Pistol_Star.
- Hypergiant wikiPageWikiLink Population_III.
- Hypergiant wikiPageWikiLink Pulsar.
- Hypergiant wikiPageWikiLink RSGC1.
- Hypergiant wikiPageWikiLink RW_Cephei.
- Hypergiant wikiPageWikiLink Radiative_flux.
- Hypergiant wikiPageWikiLink Rho_Cassiopeiae.
- Hypergiant wikiPageWikiLink S_Doradus.
- Hypergiant wikiPageWikiLink S_Persei.
- Hypergiant wikiPageWikiLink Sagittarius_(constellation).
- Hypergiant wikiPageWikiLink Scorpius_OB1.
- Hypergiant wikiPageWikiLink Solar_mass.
- Hypergiant wikiPageWikiLink Solar_masses.
- Hypergiant wikiPageWikiLink Spectral_line.
- Hypergiant wikiPageWikiLink Spectral_lines.
- Hypergiant wikiPageWikiLink Star.
- Hypergiant wikiPageWikiLink Stellar_classification.
- Hypergiant wikiPageWikiLink Stellar_kinematics.
- Hypergiant wikiPageWikiLink Stellar_population.
- Hypergiant wikiPageWikiLink Stellar_wind.
- Hypergiant wikiPageWikiLink Stephenson_2.
- Hypergiant wikiPageWikiLink Sun.
- Hypergiant wikiPageWikiLink Supergiant.
- Hypergiant wikiPageWikiLink Supernova.
- Hypergiant wikiPageWikiLink V1427_Aquilae.
- Hypergiant wikiPageWikiLink V1429_Aquilae.
- Hypergiant wikiPageWikiLink V1768_Cygni.
- Hypergiant wikiPageWikiLink V2140_Cygni.