@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@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#> .

mdl:-VMZB718S-0
  skos:prefLabel "étoile de population I"@fr, "population I star"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-TTQ078XH-0
  skos:prefLabel "astronomie stellaire"@fr, "stellar astronomy"@en ;
  a skos:Concept ;
  skos:narrower mdl:-BCTMDHSL-H .

mdl:-SWH5WDT1-R
  skos:prefLabel "étoile de population III"@fr, "population III star"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-LVFJ23QX-9
  skos:prefLabel "contrepartie X"@fr, "X-ray counterpart"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-BCTMDHSL-H
  skos:prefLabel "stellar population"@en, "population stellaire"@fr ;
  skos:hiddenLabel "Stellar population"@en, "stellar populations"@en, "Population stellaires"@fr, "Population stellaire"@fr, "populations stellaires"@fr ;
  skos:narrower mdl:-SWH5WDT1-R, mdl:-BRKH6DSF-1, mdl:-H70GPRWL-1, mdl:-VMZB718S-0, mdl:-X1VF9KN4-Z, mdl:-LVFJ23QX-9, mdl:-HTN5N9H1-Q ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Stellar_population>, <https://fr.wikipedia.org/wiki/Population_stellaire> ;
  skos:definition "Les étoiles de notre galaxie furent classées en deux populations stellaires, dites \"Population I\" et \"Population II\" par Walter Baade en 1944. Le critère de classification était la largeur des raies spectrales des étoiles de la partie centrale des galaxies (Population I) comparée à celle des étoiles du bord des galaxies (raies plus fines), la Population II. Il faut attendre les années 1950 pour que cette dichotomie soit reliée à l'abondance chimique de surface des étoiles. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Population_stellaire\" target=\"_blank\">https://fr.wikipedia.org/wiki/Population_stellaire</a>)"@fr, "During 1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations. In the abstract of the article by Baade, he recognizes that Jan Oort originally conceived this type of classification in 1926. Baade observed that bluer stars were strongly associated with the spiral arms, and yellow stars dominated near the central galactic bulge and within globular star clusters.Two main divisions were defined as population I and population II, with another newer, hypothetical division called population III added in 1978. Among the population types, significant differences were found with their individual observed stellar spectra. These were later shown to be very important and were possibly related to star formation, observed kinematics, stellar age, and even galaxy evolution in both spiral and elliptical galaxies. These three simple population classes usefully divided stars by their chemical composition or metallicity. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Stellar_population\" target=\"_blank\">https://en.wikipedia.org/wiki/Stellar_population</a>)"@en ;
  dc:modified "2022-09-30"^^xsd:date ;
  skos:broader mdl:-TTQ078XH-0 ;
  a skos:Concept ;
  skos:inScheme mdl: .

mdl:-X1VF9KN4-Z
  skos:prefLabel "étoile à grande vitesse"@fr, "high-velocity star"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-H70GPRWL-1
  skos:prefLabel "contrepartie optique"@fr, "optical counterpart"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-HTN5N9H1-Q
  skos:prefLabel "étoile de population II"@fr, "population II star"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl:-BRKH6DSF-1
  skos:prefLabel "contrepartie radio"@fr, "radio counterpart"@en ;
  a skos:Concept ;
  skos:broader mdl:-BCTMDHSL-H .

mdl: a skos:ConceptScheme .