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Match in 2 ontologies from Ontoportal-Astro (2) in 0.26s
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O associations - Unified Astronomy Thesaurus (UAT)
http://astrothesaurus.org/uat/1133
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O clusters - UAT
http://astrothesaurus.org/uat/1134
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O stars - UAT
http://astrothesaurus.org/uat/1137
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.
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O subgiant stars - UAT
http://astrothesaurus.org/uat/1132
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O dwarf stars - UAT
http://astrothesaurus.org/uat/1135
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O giant stars - UAT
http://astrothesaurus.org/uat/1136
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O subdwarf stars - UAT
http://astrothesaurus.org/uat/1138
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O supergiant stars - UAT
http://astrothesaurus.org/uat/1139
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Modified Newtonian dynamics - UAT
http://astrothesaurus.org/uat/1069
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O associations - IVOA Unified Astronomy Thesaurus (IVOA rendering) (IVOA_UAT)
http://www.ivoa.net/rdf/uat#o-associations
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7 more from this ontology
O clusters - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-clusters
N/D
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O stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-stars
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.
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O dwarf stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-dwarf-stars
N/D
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O giant stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-giant-stars
N/D
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O subdwarf stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-subdwarf-stars
N/D
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O subgiant stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-subgiant-stars
N/D
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O supergiant stars - IVOA_UAT
http://www.ivoa.net/rdf/uat#o-supergiant-stars
N/D
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O-type star - Astronomy Thesaurus (MDL)
http://data.loterre.fr/ark:/67375/MDL-JDTMJ098-8
An O star, or O-type star, is a massive, luminous, blue star of spectral type O. O stars have surface temperatures of 30,000°–50,000°C and masses of 20–100 solar masses. Their spectra are dominated by emission lines of singly ionized helium (these lines forming the so-called Pickering series). Most other lines are from at least doubly ionized elements, although H and He I lines are also present. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/O/Ostar.html )
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