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      , {"_about" : "http://astrothesaurus.org/uat/226", "narrower" : ["http://astrothesaurus.org/uat/1025"]}
      , {"_about" : "http://astrothesaurus.org/uat/995", "narrower" : ["http://astrothesaurus.org/uat/1025"]}
      ], "contributor" : "http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie", "dctermsModified" : "Tue, 10 Nov 2020 19:23:39 GMT+0000", "definition" : "Chemically peculiar stars of late B-types. The most distinctive features of Mercury-manganese stars are extreme atmospheric overabundance of Hg (up to 5 dex) and of Mn (up to 3 dex). The origin of abundance anomalies observed in late B-type stars with HgMn peculiarity is still poorly understood. More than two thirds of the HgMn stars are known to belong to spectroscopic binaries with a preference of orbital periods ranging from 3 to 20 days.", "prefLabel" : {"_value" : "Mercury-manganese stars", "_lang" : "en"}
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