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Ursa Major and Polaris with names of bright stars in the Big Dipper The constellation Ursa Major as it can be seen by the unaided eye The outline of the seven bright stars of Ursa Major form the asterism known as the " Big Dipper " in the United States and Canada, while in the United Kingdom it is called the Plough [ 6 ] or (historically ...
Polaris Aa, the supergiant primary component, is a low-amplitude Population I classical Cepheid variable, although it was once thought to be a type II Cepheid due to its high galactic latitude. Cepheids constitute an important standard candle for determining distance, so Polaris, as the closest such star, [10] is heavily studied.
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Iota Ursae Majoris (ι Ursae Majoris, abbreviated Iota UMa, ι UMa), also named Talitha / ˈ t æ l ɪ θ ə /, [14] is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of 3.14, [2] making it visible to the naked eye and placing it among the brighter members of this constellation.
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BZ Ursae Majoris is a dwarf nova star system in the northern circumpolar constellation of Ursa Major. It consists of a white dwarf primary in a close orbit with a red dwarf . The latter star is donating mass, which is accumulating in an accretion disk orbiting the white dwarf. [ 14 ]