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R Corona Borealis stars
Only around 50 known in the Galaxy and Magellanic Clouds.
- 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
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).