Triggers:LBVs

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Known also as S Dor stars. Exhibit slow changes in brightness with occasional outbursts of substantial mass loss. Known example: Eta Carinae.

ESO-Eta Carinae-phot-17a-08-normal.jpg

<math>M_V \sim -11 \ldots -8</math> mag

  • Baseline micro-variability: P around 10-20 days, amplitude 0.1-0.2 mag
  • "normal eruptions": 1-2 mag (rise within few months), repeating with period of years or decades the brighter abs.mag the shorter period between eruptions)
  • Giant eruptions ("Eta Carinae type") of around 8 mag, once a few centuries!!
  • After giant eruption and fade, the star recovers its brightness as the dust disperses.