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Supergiants are among the most massive and most luminous stars. Supergiant stars occupy the top region of the Hertzsprung–Russell diagram, with absolute visual magnitudes between about −3 and −8. The temperatures of supergiant stars range from about 3,400 K to over 20,000 K.
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stars supergiants luminosity luminous spectral red massive helium main-sequence blue surface elements hydrogen class evolved yellow star agb variables luminosities
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Iab are used for intermediate-luminosity supergiants | instance of | and classifications | 0.80 | text |
| W Virginis itself | instance of | most notably W Virginis variables | 0.80 | text |
| stars that are executing a blue loop triggered by thermal pulsing | instance of | most notably W Virginis variables | 0.80 | text |
| microturbulence | instance of | although such stars are also affected by other properties | 0.80 | text |
| VX Sagittarii.Although supergiants exist in every class from O to M | instance of | there are potential exceptions among extreme stars | 0.80 | text |
| the majority are spectral type B | instance of | there are potential exceptions among extreme stars | 0.80 | text |
| Cepheid pulsations | instance of | often due to instability | 0.80 | text |
| the RV Tauri variables | instance of | highly expanded and unstable low-mass stars | 0.80 | text |
| W Virginis variables may be given a supergiant classification | instance of | but particularly unstable stars | 0.80 | text |
| Alpha Cygni variables | instance of | 3.VariabilityWhile most supergiants | 0.80 | text |
| semiregular variables | instance of | 3.VariabilityWhile most supergiants | 0.80 | text |
| and irregular variables show some degree of photometric variability | instance of | 3.VariabilityWhile most supergiants | 0.80 | text |
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