The start has a very large planet orbiting it. Simple answer. Very, very big.
If you read up on the observances, they are not evenly timed and the dimming varies. I don't think there is a simple answer because the whole point of the articles on this star are that the dimming effect is irregular and complicated.
35 posted on 05/22/2016 9:44:44 PM PDT by UCANSEE2
(Lost my tagline on Flight MH370. Sorry for the inconvenience.)