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Z Ursae Minoris : ウィキペディア英語版 | Z Ursae Minoris
Z Ursae Minoris (Z UMi) is a star in the constellation Ursa Minor. It was confirmed to be one of a rare class of stars—R Coronae Borealis variables—after its spectrum was analysed in 2006. Initially observed to be variable in 1934, it suddenly dropped 6 magnitudes in 1992 and was subsequently diagnosed as an RcB star. Up till this point it was thought to have been a long period (Mira) variable.〔 ==References==
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