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Variable star
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==== Fast yellow pulsating supergiants ==== A fast yellow pulsating supergiant (FYPS) is a luminous yellow supergiant with pulsations shorter than a day. They are thought to have evolved beyond a red supergiant phase, but the mechanism for the pulsations is unknown. The class was named in 2020 through analysis of [[TESS]] observations.<ref name=trevor2020>{{cite journal|arxiv=2008.11723|last1=Dorn-Wallenstein|first1=Trevor Z.|last2=Levesque|first2=Emily M.|last3=Neugent|first3=Kathryn F.|last4=Davenport|first4=James R. A.|last5=Morris|first5=Brett M.|last6=Gootkin|first6=Keyan|title=Short Term Variability of Evolved Massive Stars with TESS II: A New Class of Cool, Pulsating Supergiants|journal=The Astrophysical Journal|year=2020|volume=902|issue=1|page=24|doi=10.3847/1538-4357/abb318|bibcode=2020ApJ...902...24D|s2cid=221340538 |doi-access=free }}</ref>
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