{ "format" : "linked-data-api", "version" : "0.2", "result" : {"_about" : "https://vocabs.ardc.edu.au/repository/api/lda/aas/the-unified-astronomy-thesaurus/5-0-0/resource.text?uri=http://astrothesaurus.org/uat/1137", "definition" : "https://vocabs.ardc.edu.au/repository/api/lda/aas/the-unified-astronomy-thesaurus/5-0-0/resource.text?uri=http://astrothesaurus.org/uat/1137", "extendedMetadataVersion" : "https://vocabs.ardc.edu.au/repository/api/lda/aas/the-unified-astronomy-thesaurus/5-0-0/resource.text?_metadata=all&uri=http://astrothesaurus.org/uat/1137", "primaryTopic" : {"_about" : "http://astrothesaurus.org/uat/1137", "altLabel" : [{"_value" : "Class O stars", "_lang" : "en"} , {"_value" : "O-type stars", "_lang" : "en"} ], "broader" : [{"_about" : "http://astrothesaurus.org/uat/2051", "narrower" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/430", "narrower" : ["http://astrothesaurus.org/uat/1137"]} ], "contributor" : "http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie_Admin", "dctermsModified" : "Tue, 03 Nov 2020 19:46:55 GMT+0000", "definition" : "A luminous, hot, blue star whose spectrum is dominated by the lines of hydrogen, atomic helium, and ionized helium; also known as O-type star. This is the earliest spectral type and the only main sequence star in which ionized helium is present. The effective temperatures of these stars range from about 30,000 K to 50,000 K, their luminosities from 50,000 to 1,000,000 times that of solar luminosity, and their masses from about 20 to 100 solar masses. The hottest O-type stars display high ionization emission features such as N III and He II, Of star. They are divided into subtypes O2, the hottest, to O9.7, the coldest. O-type stars are relatively rare, for each star of 100 solar masses there are 10^6 stars of solar mass. They are relatively short-lived since they spend only a few million years on the main sequence. The brightest O-type star in the sky visible with naked eye is Alnitak.", "narrower" : [{"_about" : "http://astrothesaurus.org/uat/1132", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1135", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1136", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1138", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1139", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1153", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1154", "broader" : ["http://astrothesaurus.org/uat/1137"]} , {"_about" : "http://astrothesaurus.org/uat/1155", "broader" : ["http://astrothesaurus.org/uat/1137"]} ], "prefLabel" : {"_value" : "O stars", "_lang" : "en"} , "related" : [{"_about" : "http://astrothesaurus.org/uat/1589", "related" : ["http://astrothesaurus.org/uat/1137"]} ], "type" : ["http://www.w3.org/2000/01/rdf-schema#Resource", "http://www.w3.org/2004/02/skos/core#Concept"]} , "type" : ["http://purl.org/linked-data/api/vocab#ItemEndpoint", "http://purl.org/linked-data/api/vocab#Page"]} }