<http://astrothesaurus.org/uat/1137> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#NamedIndividual> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2004/02/skos/core#Concept> . <http://astrothesaurus.org/uat/1137> <http://purl.org/dc/terms/modified> "2020-11-03T19:46:55.553Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> . <http://astrothesaurus.org/uat/1137> <http://purl.org/dc/terms/modified> "2020-11-03T19:47:07.379Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#prefLabel> "O stars"@en . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#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."@en . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#altLabel> "Class O stars"@en . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#altLabel> "O-type stars"@en . <http://astrothesaurus.org/uat/1137> <http://purl.org/dc/terms/contributor> <http://editor.vocabs.ands.org.au/user/AAS_Frey.Katie_Admin> . <http://astrothesaurus.org/uat/1137> <http://data.bioontology.org/metadata/def/mappingLoom> "ostars" . <http://astrothesaurus.org/uat/1137> <http://data.bioontology.org/metadata/def/mappingSameURI> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/2051> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/430> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1132> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1135> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1136> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1138> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1139> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1153> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1154> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1155> . <http://astrothesaurus.org/uat/1137> <http://www.w3.org/2004/02/skos/core#related> <http://astrothesaurus.org/uat/1589> . <http://astrothesaurus.org/uat/1137> <http://data.bioontology.org/metadata/def/mappingSameURI> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1132> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1135> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1136> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1138> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1139> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1153> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1154> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1155> <http://www.w3.org/2004/02/skos/core#broader> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/2051> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/430> <http://www.w3.org/2004/02/skos/core#narrower> <http://astrothesaurus.org/uat/1137> . <http://astrothesaurus.org/uat/1589> <http://www.w3.org/2004/02/skos/core#related> <http://astrothesaurus.org/uat/1137> .