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- BY_Draconis_variable abstract "BY Draconis variables are main-sequence variable stars of late spectral types, usually K or M. The name comes from the archetype for this category of variable star system, BY Draconis. They exhibit variations in their luminosity due to rotation of the star coupled with star spots, and other chromospheric activity. Resultant brightness fluctuations are generally less than 0.5 magnitudes. Light curves from BY Draconis variables are quasiperiodic. The period is close to the star's mean rotational rate. The light curve is irregular over the duration of the period and the light curve changes slightly in shape form one period to the next. For the star BY Draconis the shape of the light curve over a period remained similar for a month.Nearby K and M stars that are BY Draconis variables include Barnard's Star, Kapteyn's star, 61 Cygni, Ross 248, Lacaille 8760, Lalande 21185 and Luyten 726-8. Ross 248 is the first discovered BY Draconis variable, the variability was discovered by Gerald E. Kron on 1950. The variability of BY Draconis itself was discovered in 1966 and studied in detail by Sugainov over the period 1973-1976.Oddly enough, Procyon, which is much brighter than the Sun and has a spectral type of F5 IV/V, is also claimed to be a BY Draconis variable. Procyon is unusual in two ways, it is moving off the main sequence into the subgiant phase, and it is midway between PP burning and CNO burning which means that it is intermediate between having a convective and non-convective outer layer. Either reason could explain the larger than normal star spots.Some of these stars may exhibit flares, resulting in additional variations of the UV Ceti type. Likewise, the spectra of BY Dra variables (particularly in their H and K lines) are similar to RS CVn stars, which are another class of variable stars that have active chromospheres.".
- BY_Draconis_variable wikiPageID "2712792".
- BY_Draconis_variable wikiPageRevisionID "589201452".
- BY_Draconis_variable hasPhotoCollection BY_Draconis_variable.
- BY_Draconis_variable subject Category:BY_Draconis_variables.
- BY_Draconis_variable subject Category:Variable_stars.
- BY_Draconis_variable type BYDraconisVariables.
- BY_Draconis_variable type CelestialBody109239740.
- BY_Draconis_variable type NaturalObject100019128.
- BY_Draconis_variable type Object100002684.
- BY_Draconis_variable type PhysicalEntity100001930.
- BY_Draconis_variable type Star109444100.
- BY_Draconis_variable type Thing100002452.
- BY_Draconis_variable type Variable109468959.
- BY_Draconis_variable type VariableStar109469152.
- BY_Draconis_variable type VariableStars.
- BY_Draconis_variable type Whole100003553.
- BY_Draconis_variable comment "BY Draconis variables are main-sequence variable stars of late spectral types, usually K or M. The name comes from the archetype for this category of variable star system, BY Draconis. They exhibit variations in their luminosity due to rotation of the star coupled with star spots, and other chromospheric activity. Resultant brightness fluctuations are generally less than 0.5 magnitudes. Light curves from BY Draconis variables are quasiperiodic.".
- BY_Draconis_variable label "BY Draconis variable".
- BY_Draconis_variable label "BY-Draconis-Stern".
- BY_Draconis_variable label "Estrella variable BY Draconis".
- BY_Draconis_variable label "Variabile BY Draconis".
- BY_Draconis_variable label "Étoile variable de type BY Draconis".
- BY_Draconis_variable label "Переменная типа BY Дракона".
- BY_Draconis_variable label "りゅう座BY型変光星".
- BY_Draconis_variable label "天龍座BY型變星".
- BY_Draconis_variable sameAs BY-Draconis-Stern.
- BY_Draconis_variable sameAs Estrella_variable_BY_Draconis.
- BY_Draconis_variable sameAs Étoile_variable_de_type_BY_Draconis.
- BY_Draconis_variable sameAs Variabile_BY_Draconis.
- BY_Draconis_variable sameAs りゅう座BY型変光星.
- BY_Draconis_variable sameAs m.07zkp8.
- BY_Draconis_variable sameAs Q797219.
- BY_Draconis_variable sameAs Q797219.
- BY_Draconis_variable sameAs BY_Draconis_variable.
- BY_Draconis_variable wasDerivedFrom BY_Draconis_variable?oldid=589201452.
- BY_Draconis_variable isPrimaryTopicOf BY_Draconis_variable.