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- R_Coronae_Borealis_variable abstract "A R Coronae Borealis variable (abbreviated RCB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation (a few tenths of a magnitude), and one irregular unpredictably sudden fading by 1 to 9 magnitudes. The prototype star R Coronae Borealis was discovered by the English amateur astronomer Edward Pigott in 1795, who first observed the enigmatic fadings of the star. Since then, only about 100 RCB variables have been identified, making this class a very rare kind of star.The fading is caused by condensation of carbon to soot, making the star fade in visible light while measurements in infrared light exhibit no real luminosity decrease. R Coronae Borealis variables are typically supergiant stars in the spectral classes F and G (by convention called "yellow"), with typical C2 and CN molecular bands, characteristic of yellow supergiants. RCB star atmospheres do however lack hydrogen by an abundance of 1 part per 1,000 down to 1 part per 1,000,000 relative to helium and other chemical elements, while the universal abundance of hydrogen is about 3 to 1 relative to helium.".
- R_Coronae_Borealis_variable thumbnail R_CrB.png?width=300.
- R_Coronae_Borealis_variable wikiPageExternalLink nph-iarticle_query?1996PASP..108..225C&classic=YES.
- R_Coronae_Borealis_variable wikiPageExternalLink 2002_rcrb.ps.
- R_Coronae_Borealis_variable wikiPageExternalLink 0100.shtml.
- R_Coronae_Borealis_variable wikiPageExternalLink 0801.shtml.
- R_Coronae_Borealis_variable wikiPageExternalLink R_Coronae_Borealis_star.html.
- R_Coronae_Borealis_variable wikiPageID "15515673".
- R_Coronae_Borealis_variable wikiPageRevisionID "598058916".
- R_Coronae_Borealis_variable hasPhotoCollection R_Coronae_Borealis_variable.
- R_Coronae_Borealis_variable subject Category:Eruptive_variables.
- R_Coronae_Borealis_variable subject Category:R_Coronae_Borealis_variables.
- R_Coronae_Borealis_variable subject Category:Variable_stars.
- R_Coronae_Borealis_variable type CelestialBody109239740.
- R_Coronae_Borealis_variable type EruptiveVariables.
- R_Coronae_Borealis_variable type NaturalObject100019128.
- R_Coronae_Borealis_variable type Object100002684.
- R_Coronae_Borealis_variable type PhysicalEntity100001930.
- R_Coronae_Borealis_variable type RCoronaeBorealisVariables.
- R_Coronae_Borealis_variable type Star109444100.
- R_Coronae_Borealis_variable type Thing100002452.
- R_Coronae_Borealis_variable type Variable109468959.
- R_Coronae_Borealis_variable type VariableStar109469152.
- R_Coronae_Borealis_variable type VariableStars.
- R_Coronae_Borealis_variable type Whole100003553.
- R_Coronae_Borealis_variable comment "A R Coronae Borealis variable (abbreviated RCB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation (a few tenths of a magnitude), and one irregular unpredictably sudden fading by 1 to 9 magnitudes. The prototype star R Coronae Borealis was discovered by the English amateur astronomer Edward Pigott in 1795, who first observed the enigmatic fadings of the star.".
- R_Coronae_Borealis_variable label "Estrella variable R Coronae Borealis".
- R_Coronae_Borealis_variable label "Gwiazdy zmienne typu R Coronae Borealis".
- R_Coronae_Borealis_variable label "R Coronae Borealis variable".
- R_Coronae_Borealis_variable label "R-Coronae-Borealis-Stern".
- R_Coronae_Borealis_variable label "Variabile R Coronae Borealis".
- R_Coronae_Borealis_variable label "Étoile variable de type R Coronae Borealis".
- R_Coronae_Borealis_variable label "Переменная типа R Северной Короны".
- R_Coronae_Borealis_variable label "かんむり座R型変光星".
- R_Coronae_Borealis_variable label "北冕座R型變星".
- R_Coronae_Borealis_variable sameAs R-Coronae-Borealis-Stern.
- R_Coronae_Borealis_variable sameAs Estrella_variable_R_Coronae_Borealis.
- R_Coronae_Borealis_variable sameAs Étoile_variable_de_type_R_Coronae_Borealis.
- R_Coronae_Borealis_variable sameAs Variabile_R_Coronae_Borealis.
- R_Coronae_Borealis_variable sameAs かんむり座R型変光星.
- R_Coronae_Borealis_variable sameAs Gwiazdy_zmienne_typu_R_Coronae_Borealis.
- R_Coronae_Borealis_variable sameAs m.03mcyst.
- R_Coronae_Borealis_variable sameAs Q920941.
- R_Coronae_Borealis_variable sameAs Q920941.
- R_Coronae_Borealis_variable sameAs R_Coronae_Borealis_variable.
- R_Coronae_Borealis_variable wasDerivedFrom R_Coronae_Borealis_variable?oldid=598058916.
- R_Coronae_Borealis_variable depiction R_CrB.png.
- R_Coronae_Borealis_variable isPrimaryTopicOf R_Coronae_Borealis_variable.
