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physical object > natural object > celestial body > star > dwarf > red dwarf > flare star
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flare star
(UV Ceti star)
subjectfact 
flare starhas synonym UV Ceti star2001-09-27 09:30:41.0
has definition Dim red dwarf star that suddenly lights up with great - but brief - luminosity, corresponding to an equally powerful but short-lived burst of radio emission. The cause is thought to be a sudden and intense outburst of radiation on or above the star's surface.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:30:41.0
has definition A star that emits flares, which can outshine the entire star. Many red dwarfs are flare stars.has source: Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books, 2001-09-27 09:30:41.0
has definition A member of a class of dwarf stars (usually dM3e-dM6e) that show sudden, intense outbursts of energy. The flares are usually rare and very short with mean amplitudes of about 0.5-0.6 mag. All known flare stars are intrinsically faint and have emission lines of H I and Ca II. It is generally believed that flares in flare stars have certain properties in common: rapid rise to peak light followed initially by a rapid decline and later by a slower phase that occasionally does not return to a preflare level within practical monitoring times (several hours). An increase in radio emission is often detected simultaneously with the optical outburst. About 30 flare stars are known, all within 20 pc. (In at least one theory, the flare star stage directly follows the T Tauri stage.)has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:41.0
has definition Stars undergoing erratic jumps in brightness (up to a few magnitudes) on time scales of the order of minutes. During the quiescent phase the spectrum is that of an M dwarf with emissions in the CaII and Balmer lines.has source: Jaschek, C., Jaschek, M. 1995 The Behavior of Chemical Elements in Stars, Cambridge University Press, 2001-09-27 09:30:41.0
is a kind of radio star2001-09-27 09:30:32.0
is a kind of cataclysmic variable2001-09-27 09:30:41.0
is a kind of red dwarfhas source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:30:41.0
red dwarfhas abundance 70 percent of all stars2001-09-27 09:30:52.0
has spectral type M2001-09-27 09:30:52.0
cataclysmic variablehas peak brightness2001-09-27 09:30:40.0
has recovery time2001-09-27 09:30:40.0
has outburst start time2001-09-27 09:30:40.0
has acronym CV2001-09-27 09:30:40.0
starhas star surface temperature2001-09-27 09:30:25.0
has V magnitude2001-09-27 09:30:25.0
has B magnitude2001-09-27 09:30:25.0
has U magnitude2001-09-27 09:30:25.0
has position on celestial sphere from the point of view of Earth2001-09-27 09:30:25.0
has parallax from the point of view of Earth's orbit2001-09-27 09:30:25.0
has proper motion2001-09-27 09:30:24.0
has radiation at surface which is diffused out from the hotter core2001-09-27 09:30:24.0
has energy source gravitational contraction and or fusion2001-09-27 09:30:24.0
has energy production which takes place primarily within the core2001-09-27 09:30:24.0
has surface density which depends on luminosity class2001-09-27 09:30:24.0
has surface temperature greater than 1000 Kelvin2001-09-27 09:30:24.0
has apparent magnitude2001-09-27 09:30:25.0
has absolute magnitude2001-09-27 09:30:25.0
has age2001-09-27 09:30:25.0
has catalog star catalog2001-09-27 09:30:25.0
has material hydrogen, helium2001-09-27 09:30:24.0
has velocity determined from proper motion and radial velocity2001-09-27 09:30:25.0
has mass greater than 0.08 the sun's mass2001-09-27 09:30:24.0
dwarfhas symbol d2001-09-27 09:30:52.0
has luminosity class V2001-09-27 09:30:52.0
celestial bodyhas spectra2001-09-27 09:30:09.0
variablehas name designated with
  1. R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
  2. 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
  3. 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
  4. V 335, V 336, etc., when the double letter designations are exhausted
2001-09-27 09:30:34.0
has observational problem some difficulty in distinguishing between various kinds2001-09-27 09:30:34.0
has observable variation time scale within a period of decadeshas URL: http://www.aavso.org, 2001-09-27 09:30:34.0
has light curve2001-09-27 09:30:34.0
has optical brightness variation 0.2 magnitudes or greater2001-09-27 09:30:34.0
has amplitude2001-09-27 09:30:34.0
physical objecthas location or center of gravity2001-09-27 09:27:27.0
has angular momentum2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0

Kinds of flare star :

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