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In page Variable star:

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Also known as the S Doradus variables, luminous blue variables (LBV) are among the most luminous stars known. Examples include the hypergiants η Carinae and P Cygni.[2] They have permanent high mass loss, but at intervals of years internal pulsations cause the star to exceed its Eddington limit and the mass loss increases significantly.[3] Visual brightness increases although the overall luminosity is largely unchanged.[citation needed] Giant eruptions observed in a few LBVs do increase the luminosity, so much so that they have been tagged supernova impostors, and may be a different type of event.[3]