R Coronae Borealis star

      any of a small group of old stars of the class called peculiar variables that maintain nearly uniform brightness for indeterminate lengths of time and then fall abruptly and dramatically in brightness over the course of a few weeks or less, returning slowly and irregularly to their previous level over several months. Such stars are rich in carbon, and it is believed that the fall in brightness is due to the star's emission of carbon, which then condenses to a dense cloud near the star, rather than to a change in luminosity of the star itself. Gradual dissipation of the cloud restores the star's earlier brightness. Details of the process, however, remain to be clarified.

John Donald Fernie
 

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Universalium. 2010.

Look at other dictionaries:

  • R Coronae Borealis variable — A R Coronae Borealis variable (abbreviated RCB) is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation, and one irregularly occurring sudden fading by 1 to 9 magnitudes. The prototype star R Coronae… …   Wikipedia

  • R Coronae Borealis — Starbox begin name=R CrBStarbox image caption = R Coronae Borealis Starbox observe epoch=J2000 ra=RA|15|48|34.4149 dec=DEC|+28|09|24.296 appmag v=5.9 constell=Corona Borealis Starbox character class=G0Iab:pe b v=? u b=? variable=Variable Star of… …   Wikipedia

  • R Coronae Borealis — Constelación Corona Boreal Ascensión recta α 15h 48min 34,42s Declinación δ +28º 09’ 24,4’’ Distancia …   Wikipedia Español

  • Estrella variable R Coronae Borealis — Las estrellas variables R Coronae Borealis (variables R CrB) son un tipo de de variables eruptivas supergigantes de tipo espectral F o G. Son ricas en carbono y pobres en hidrógeno, y se caracterizan por una drástica disminución en su luminosidad …   Wikipedia Español

  • Beta Coronae Borealis — β Coronae Borealis …   Wikipedia

  • Rho Coronae Borealis — Starbox begin name = Rho Coronae BorealisStarbox observe epoch = J2000.0 constell = Corona Borealis ra = RA|16|01|02.6616 dec = DEC|+33|18|12.634 appmag v = 5.4Starbox character class = G0 2Va b v = 0.61 variable = None Starbox astrometry radial… …   Wikipedia

  • R-Coronae-Borealis — Datenbanklinks zu R Coronae Borealis Stern R Coronae Borealis Beobachtungsdaten …   Deutsch Wikipedia

  • R-Coronae-Borealis-Stern — Lichtkurve des Leuchtverhaltens von R Coronae Borealis über einen Zeitraum von etwa 8 Jahren. (Zeitangaben als Julianisches Datum) R Coronae Borealis Sterne (GCVS Systematikkürzel: RCB) sind Sterne, deren Helligkeit in unregelmäßigen Abständen… …   Deutsch Wikipedia

  • Rho Coronae Borealis b — Planetbox begin name = Rho Coronae Borealis bPlanetbox star star = Rho Coronae Borealis constell = Corona Borealis ra = RA|16|01|02.6616 dec = DEC|+33|18|12.634 dist ly = 56.8±0.7 dist pc = 17.4±0.2 class = G0 2VaPlanetbox orbit separation =… …   Wikipedia

  • Rho Coronae Borealis — Constelación Corona Borealis Ascensión recta α 16h 01min 02,66s Declinación δ +33º 18’ 12,6’’ Distancia …   Wikipedia Español

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