@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<http://astrothesaurus.org/uat/1155>
  skos:altLabel "Of-type stars"@en, "Of type stars"@en ;
  a skos:Concept ;
  dc:contributor <http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie_Admin> ;
  skos:broader <http://astrothesaurus.org/uat/428>, <http://astrothesaurus.org/uat/1137> ;
  skos:prefLabel "Of stars"@en ;
  skos: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."@en ;
  skos:editorialNote [ ] ;
  dc:modified "2020-11-05T20:26:32.413Z"^^xsd:dateTime, "2020-11-05T20:26:46.364Z"^^xsd:dateTime .

<http://astrothesaurus.org/uat/1137>
  skos:prefLabel "O stars"@en ;
  a skos:Concept ;
  skos:narrower <http://astrothesaurus.org/uat/1155> .

<http://astrothesaurus.org/uat/428>
  skos:prefLabel "Early-type emission stars"@en ;
  a skos:Concept ;
  skos:narrower <http://astrothesaurus.org/uat/1155> .