Editing Variable star (section)

=====Luminous blue variables=====
{{Main|Luminous blue variable}}

Also known as the [[S Doradus]] variables, the most luminous stars known belong to this class. Examples include the [[hypergiant]]s [[Eta Carinae|η Carinae]] and [[P Cygni]]. 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 hugely. Visual brightness increases although the overall luminosity is largely unchanged. Giant eruptions observed in a few LBVs do increase the luminosity, so much so that they have been tagged [[supernova impostor]]s, and may be a different type of event.