@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ns0: <http://www.ivoa.net/rdf/uat#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix metadata_def: <http://data.bioontology.org/metadata/def/> .
@prefix ns1: <http://astrothesaurus.org/uat/> .
ns0:o-dwarf-stars
skos:broader ns0:o-stars .
ns0:o-giant-stars
skos:broader ns0:o-stars .
ns0:o-stars
metadata_def:mappingLoom "ostars" ;
metadata_def:mappingSameURI ns0:o-stars ;
a owl:NamedIndividual, skos:Concept ;
skos:broader ns0:early-type-stars, ns0:stellar-spectral-types ;
skos: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." ;
skos:exactMatch <http://astrothesaurus.org/uat/1137> ;
skos:prefLabel "O stars" ;
skos:related ns0:stellar-classification .
ns0:o-subdwarf-stars
skos:broader ns0:o-stars .
ns0:o-subgiant-stars
skos:broader ns0:o-stars .
ns0:o-supergiant-stars
skos:broader ns0:o-stars .
ns0:oe-stars
skos:broader ns0:o-stars .
ns0:oef-stars
skos:broader ns0:o-stars .
ns0:of-stars
skos:broader ns0:o-stars .
ns0:stellar-classification
skos:related ns0:o-stars .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ns0: <http://www.ivoa.net/rdf/uat#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix metadata_def: <http://data.bioontology.org/metadata/def/> .
@prefix ns1: <http://astrothesaurus.org/uat/> .
ns0:o-dwarf-stars
skos:broader ns0:o-stars .
ns0:o-giant-stars
skos:broader ns0:o-stars .
ns0:o-stars
metadata_def:mappingLoom "ostars" ;
metadata_def:mappingSameURI ns0:o-stars ;
a owl:NamedIndividual, skos:Concept ;
skos:broader ns0:early-type-stars, ns0:stellar-spectral-types ;
skos: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." ;
skos:exactMatch <http://astrothesaurus.org/uat/1137> ;
skos:prefLabel "O stars" ;
skos:related ns0:stellar-classification .
ns0:o-subdwarf-stars
skos:broader ns0:o-stars .
ns0:o-subgiant-stars
skos:broader ns0:o-stars .
ns0:o-supergiant-stars
skos:broader ns0:o-stars .
ns0:oe-stars
skos:broader ns0:o-stars .
ns0:oef-stars
skos:broader ns0:o-stars .
ns0:of-stars
skos:broader ns0:o-stars .
ns0:stellar-classification
skos:related ns0:o-stars .