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R Coronae Borealis

R Coronae Borealis stars (or R CrB stars) are highly evolved stars whose light undergoes dramatic dimming events caused by dust around the star.  In mid-2007, the class prototype entered one of these dimming events, and has yet to return to its normal brightness.  Astronomers use the light curves of R CrB and other stars like it to better understand what happens to stars near the ends of their lives.  Although R CrB is very faint in all but the largest telescopes, it is visible in binoculars when it is near maximum brightness.

R CrB remains in its extended faint state as of July 2013.  It had a short recovery to V=12.0 in mid-2011, faded to V=14.0 again within a few months, and made another recovery in 2012 before fading yet again.  No one has any idea when it will return to its bright state again.  It's a great target for visual and CCD observers alike, so please keep it under observation!

For more information visit: /vsots_rcrb
Prepared By: Matthew Templeton
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484