NationMaster - Encyclopedia: Beta Coronae Borealis

* Coronae - (Astronomy): Definition (475 words)
	Both alpha Coronae Borealis and beta Coronae Borealis are spectroscopic binaries, with periods of 17.36 days and 10.5 years respectively.
	Gema, Gemma and Gemma Coronae were not used in classical times, but are later titles, perhaps from Ovid's gemmasque novem that Vulcan combined with his auro to make Ariadne's Crown; but Spence said,...
	One of the oddest types of variable stars is the R Coronae Borealis class.

Corona Borealis the Northern Crown (486 words)
	Corona Borealis, the Northern Crown is, according to legend, a crown given to Ariadne in honor of her loyalty to Theseus.
	Beta Coronae Borealis, Nusakan (15h 25m.8 +29°17') is a magnitude 3.6 class F0 star about 100 light years distant.
	R Coronae Borealis (15h47m.5 +28°19') This is an irregular variable star of the type that remai n at maximum for most of their period.

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