Triggers:RCrB

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R Corona Borealis stars

Only around 50 known in the Galaxy and Magellanic Clouds.

Characteristics:

  • sudden and non-periodic drops in magnitude
  • drops by up to 8 magnitudes
  • some small variation in the baseline
  • the "dark" stage can last from days to years
  • recovers slowly to the baseline
Example of RCrB star in the LMC as seen by OGLE-II

DY Persei

Some people claim it is a similar type to RCrB, however the drops in magnitude are much smaller and seem to be periodical (P~1000d).

Example light curve of DY Per-type candidate