@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl:-K3ZRP60W-M
  skos:prefLabel "étoile variable éruptive"@fr, "eruptive star"@en ;
  a skos:Concept ;
  skos:narrower mdl:-C64CSDMF-X .

mdl:-C64CSDMF-X
  skos:prefLabel "étoile de type R Coronae Borealis"@fr, "R Coronae Borealis star"@en ;
  skos:inScheme mdl: ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/%C3%89toile_variable_de_type_R_Coronae_Borealis>, <https://www.daviddarling.info/encyclopedia/R/R_Coronae_Borealis_star.html> ;
  skos:hiddenLabel "étoiles de type R Coronae Borealis"@fr, "Etoile type R Coronae Borealis"@fr ;
  skos:altLabel "RCB star"@en, "R CrB star"@en ;
  skos:related mdl:-HZF138V3-T, mdl:-JB7HBJHZ-0 ;
  skos:definition "An R Coronae Borealis star is a luminous, eruptive variable supergiant, rich in carbon and poor in hydrogen, of spectral type F or G, unusual in that it goes into outburst not by brightening, but by fading. Each minimum is thought to be caused by carbon-rich material puffed off the star during a pulsation cycle. As the cloud moves out, it cools and eventually condenses into carbon dust particles, which absorb much of the light coming from the star's photosphere. Only when the dust has been blown away by radiation pressure, does the star return to its normal brightness. While at maximum light, R Coronae Borealis stars are observed to undergo small-scale, Cepheid-like variations with fluctuations of several tenths of a magnitude and with periods of 20 to 100 days.   (Encyclopedia of Science, by David Darling, <a href=\"https://www.daviddarling.info/encyclopedia/R/R_Coronae_Borealis_star.html\" target=\"_blank\">https://www.daviddarling.info/encyclopedia/R/R_Coronae_Borealis_star.html</a>)"@en, "Les étoiles de type R Coronae Borealis (RCB) sont une classe d'étoiles variables. Il s'agit d'une classe d'étoiles variables très spectaculaires : elles présentent, en effet, la particularité de chuter brusquement d'éclat sans périodicité apparente avec une amplitude pouvant atteindre 8 magnitudes. L'étoile prototype de ces étoiles variables est l'étoile R de la constellation de la Couronne boréale (R CrB). En 1795, l'astronome amateur Edward Pigott remarqua que cette étoile de magnitude 6 disparut subitement puis retrouva doucement son éclat quelques mois plus tard. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/%C3%89toile_variable_de_type_R_Coronae_Borealis\" target=\"_blank\">https://fr.wikipedia.org/wiki/%C3%89toile_variable_de_type_R_Coronae_Borealis</a>)"@fr ;
  skos:broader mdl:-K3ZRP60W-M ;
  a skos:Concept .

mdl:-HZF138V3-T
  skos:prefLabel "supergéante"@fr, "supergiant"@en ;
  a skos:Concept ;
  skos:related mdl:-C64CSDMF-X .

mdl:-JB7HBJHZ-0
  skos:prefLabel "carbon star"@en, "étoile carbonée"@fr ;
  a skos:Concept ;
  skos:related mdl:-C64CSDMF-X .

mdl: a skos:ConceptScheme .