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- Q920941 subject Q8617505.
- Q920941 abstract "An R Coronae Borealis variable (abbreviated RCB, RCrB) 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.".
- Q920941 thumbnail RYSgr_lightcurve.png?width=300.
- Q920941 wikiPageExternalLink nph-iarticle_query?1996PASP..108..225C&classic=YES.
- Q920941 wikiPageExternalLink 2002_rcrb.ps.
- Q920941 wikiPageExternalLink 0100.shtml.
- Q920941 wikiPageExternalLink R_Coronae_Borealis_star.html.
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- Q920941 wikiPageWikiLink Q8617505.
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- Q920941 comment "An R Coronae Borealis variable (abbreviated RCB, RCrB) 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.".
- Q920941 label "R Coronae Borealis variable".
- Q920941 depiction RYSgr_lightcurve.png.