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T Coronae Borealis, or T CrB, is a recurrent nova in the constellation Corona Borealis. It is a symbiotic binary containing a white dwarf and a red giant; material transferred from the giant accumulates on the white dwarf until a thermonuclear eruption causes a sharp increase in brightness. Recorded...
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Alphecca, formally Alpha Coronae Borealis, is the brightest star in Corona Borealis, the Northern Crown, and lies about 75 light-years from the Sun. It is an eclipsing spectroscopic binary whose two stars orbit closely enough that the system periodically changes brightness when one component passes...
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