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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 wikiPageLength "4176".
- BY_Draconis_variable wikiPageOutDegree "35".
- BY_Draconis_variable wikiPageRevisionID "651792861".
- BY_Draconis_variable wikiPageWikiLink 61_Cygni.
- BY_Draconis_variable wikiPageWikiLink Apparent_magnitude.
- BY_Draconis_variable wikiPageWikiLink BY_Draconis.
- BY_Draconis_variable wikiPageWikiLink Barnards_Star.
- BY_Draconis_variable wikiPageWikiLink CNO_cycle.
- BY_Draconis_variable wikiPageWikiLink Calcium.
- BY_Draconis_variable wikiPageWikiLink Category:BY_Draconis_variables.
- BY_Draconis_variable wikiPageWikiLink Category:Stellar_physics.
- BY_Draconis_variable wikiPageWikiLink Category:Variable_stars.
- BY_Draconis_variable wikiPageWikiLink Chromosphere.
- BY_Draconis_variable wikiPageWikiLink Flare_star.
- BY_Draconis_variable wikiPageWikiLink H_and_K_lines.
- BY_Draconis_variable wikiPageWikiLink Kapteyns_Star.
- BY_Draconis_variable wikiPageWikiLink Lacaille_8760.
- BY_Draconis_variable wikiPageWikiLink Lalande_21185.
- BY_Draconis_variable wikiPageWikiLink Light_curve.
- BY_Draconis_variable wikiPageWikiLink Luminosity.
- BY_Draconis_variable wikiPageWikiLink Luyten_726-8.
- BY_Draconis_variable wikiPageWikiLink Main_sequence.
- BY_Draconis_variable wikiPageWikiLink Procyon.
- BY_Draconis_variable wikiPageWikiLink Quasiperiodicity.
- BY_Draconis_variable wikiPageWikiLink RS_CVn.
- BY_Draconis_variable wikiPageWikiLink RS_Canum_Venaticorum_variable.
- BY_Draconis_variable wikiPageWikiLink Ross_248.
- BY_Draconis_variable wikiPageWikiLink Star.
- BY_Draconis_variable wikiPageWikiLink Star_spot.
- BY_Draconis_variable wikiPageWikiLink Starspot.
- BY_Draconis_variable wikiPageWikiLink Stellar_classification.
- BY_Draconis_variable wikiPageWikiLink Subgiant.
- BY_Draconis_variable wikiPageWikiLink UV_Ceti_variable.
- BY_Draconis_variable wikiPageWikiLink Variable_star.
- BY_Draconis_variable wikiPageWikiLinkText "BY Dra variable".
- BY_Draconis_variable wikiPageWikiLinkText "BY Dra variables".
- BY_Draconis_variable wikiPageWikiLinkText "BY Dra".
- BY_Draconis_variable wikiPageWikiLinkText "BY Draconis type".
- BY_Draconis_variable wikiPageWikiLinkText "BY Draconis variable".
- BY_Draconis_variable wikiPageWikiLinkText "BY Draconis".
- BY_Draconis_variable wikiPageWikiLinkText "BY Draconis-type".
- BY_Draconis_variable wikiPageWikiLinkText "BY".
- BY_Draconis_variable hasPhotoCollection BY_Draconis_variable.
- BY_Draconis_variable wikiPageUsesTemplate Template:Reflist.
- BY_Draconis_variable wikiPageUsesTemplate Template:Variable_star_topics.
- BY_Draconis_variable subject Category:BY_Draconis_variables.
- BY_Draconis_variable subject Category:Stellar_physics.
- BY_Draconis_variable subject Category:Variable_stars.
- BY_Draconis_variable hypernym Stars.
- BY_Draconis_variable type Animal.
- BY_Draconis_variable type Variable.
- BY_Draconis_variable type Concept.
- 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 sameAs Variable_BY_Draconis.
- BY_Draconis_variable sameAs BY-Draconis-Stern.
- BY_Draconis_variable sameAs Estrella_variable_BY_Draconis.
- BY_Draconis_variable sameAs BY_Draconis_-muuttuja.
- 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 Gwiazdy_typu_BY_Draconis.
- BY_Draconis_variable sameAs m.07zkp8.
- BY_Draconis_variable sameAs Переменная_типа_BY_Дракона.
- BY_Draconis_variable sameAs BY_Draconis_değişeni.
- BY_Draconis_variable sameAs Q797219.
- BY_Draconis_variable sameAs Q797219.
- BY_Draconis_variable sameAs 天龍座BY型變星.
- BY_Draconis_variable wasDerivedFrom BY_Draconis_variable?oldid=651792861.
- BY_Draconis_variable isPrimaryTopicOf BY_Draconis_variable.