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      , {"_value" : "Of-type stars", "_lang" : "en"}
      ], "broader" : [{"_about" : "http://astrothesaurus.org/uat/1137", "narrower" : ["http://astrothesaurus.org/uat/1155"]}
      , {"_about" : "http://astrothesaurus.org/uat/428", "narrower" : ["http://astrothesaurus.org/uat/1155"]}
      ], "contributor" : "http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie_Admin", "dctermsModified" : "Thu, 05 Nov 2020 20:26:32 GMT+0000", "definition" : "An O star whose spectrum displays strong N III 4634-4640-4642 emission and strong He II 4686 emission. The N III lines are always much stronger than C III 4647-4650-4651 when the latter are present. Historically, Of stars were considered to belong to the peculiar category, hence the f notation (see below). In his thesis work, Walborn removed them from that category and established them as the normal O-type supergiants. He also used the notation ((f)), (f), and f to describe the progression from strong He II 4686 absorption, through weakened/absent, to emission, respectively, correlated with increasing N III emission strength, subsequently showing that it is a luminosity sequence -- the first such for stars earlier than O9.", "prefLabel" : {"_value" : "Of stars", "_lang" : "en"}
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}