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physical object > natural object > celestial body > star > hydrogen-deficient star > hydrogen-deficient C star > R Coronae Borealis variable > R Coronae Borealis

R Coronae Borealis
subject			fact

R Coronae Borealis	has amplitude 6th magnitude to 14th magnitude
	has spectral type F star (F8-G0 Ib)
	has reference Clayton, G.C. : 1996, PASP 108. The R Coronae Borealis Stars
	has reference Clayton, G.C., Whitney, B.A., Stanford, S. A., Drilling, J.S. : 1992, ApJ 397, 652. Observations of R Coronae Borealis stars in decline - Empirical arguments for dust formation near the stellar surface
	has reference Whitney, B.A., Soker, N., Clayton, G.C. : 1991, AJ 102, 284. Model for R Coronae Borealis stars
	has outburst spectra with many emission-lines
	is a part of Corona Borealis
	has recovery time several months to a year
	has outburst start time within a few weeks
	has definition Star with a large infrared excess and a rather high 7Li abundance.
	is an instance of R Coronae Borealis variable
R Coronae Borealis variable	has prototype R Corona Borealis
cataclysmic variable	has synonym eruptive variable
	has synonym explosive variable
	has peak brightness
	has acronym CV
supergiant	has luminosity class I
hydrogen-deficient star	has hydrogen line strength weak
star	has star surface temperature
	has V magnitude
	has B magnitude
	has U magnitude
	has position on celestial sphere from the point of view of Earth
	has parallax from the point of view of Earth's orbit
	has proper motion
	has radiation at surface which is diffused out from the hotter core
	has energy source gravitational contraction and or fusion
	has energy production which takes place primarily within the core
	has surface density which depends on luminosity class
	has surface temperature greater than 1000 Kelvin
	has apparent magnitude
	has absolute magnitude
	has age
	has catalog star catalog
	has material hydrogen, helium
	has velocity determined from proper motion and radial velocity
	has mass greater than 0.08 the sun's mass
variable	has name designated with R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted
	has observational problem some difficulty in distinguishing between various kinds
	has observable variation time scale within a period of decades
	has light curve
	has optical brightness variation 0.2 magnitudes or greater
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has momentum
	has temperature
	has volume
	has extent

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