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- BL_Boötis abstract "BL Boötis (abbreviated to BL Boo) is a pulsating variable star in the constellation Boötes. It varies from magnitude 14.45 to 15.10 over 0.82 days. It is located 4 arcminutes from the centre of (and assumed to be a member star of) the globular cluster NGC 5466. Its variability was first noted in 1961 by Russian astronomer Nikolaĭ Efimovich Kurochkin, who gave it the variable star designation BL Boötis. However, he thought it was an eclipsing binary. It was subsequently thought to be an RR Lyrae variable by T.I. Gryzunova in 1971.Robert Zinn confirmed it was a member of the globular cluster and found it was too blue to be an RR Lyrae variable. He gave it the name V19 within the cluster. He calculated its mass to be around 1.56 times and its luminosity to be around 278 times that of the Sun; its absolute magnitude is -1.27.BL Boötis has been designated the prototype of a rare class of variable star known as an anomalous Cepheid or BL Boötis variable. These stars are somewhat similar to Cepheid variables, but they do not have the same relationship between their period and luminosity. Their periods are similar to the ab subtypes of RR Lyrae variables; however, they are far brighter than these stars. Anomalous Cepheids are metal poor and have masses not much larger than the Sun's, on average, 1.5 solar masses. The origin of these stars is uncertain, but thought to possibly be from the merger of two stars. Detailed examination of the spectrum of BL Boötis with the Keck-1 telescope at the W. M. Keck Observatory showed that its effective (surface) temperature is around 6450 K at minimum light. It also showed that the chemical composition was consistent with ageing metal-poor (Population II) stars and hence cast doubt on the origin as a result of a stellar merger. The radial velocity is slower than would be expected if it were from a stellar merger.".
- BL_Boötis wikiPageID "43478007".
- BL_Boötis wikiPageLength "4281".
- BL_Boötis wikiPageOutDegree "19".
- BL_Boötis wikiPageRevisionID "703429824".
- BL_Boötis wikiPageWikiLink Absolute_magnitude.
- BL_Boötis wikiPageWikiLink Anomalous_Cepheid.
- BL_Boötis wikiPageWikiLink Binary_star.
- BL_Boötis wikiPageWikiLink Boötes.
- BL_Boötis wikiPageWikiLink Category:Boötes_(constellation).
- BL_Boötis wikiPageWikiLink Category:Cepheid_variables.
- BL_Boötis wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- BL_Boötis wikiPageWikiLink Cepheid_variable.
- BL_Boötis wikiPageWikiLink Effective_temperature.
- BL_Boötis wikiPageWikiLink Globular_cluster.
- BL_Boötis wikiPageWikiLink Luminosity.
- BL_Boötis wikiPageWikiLink Metallicity.
- BL_Boötis wikiPageWikiLink NGC_5466.
- BL_Boötis wikiPageWikiLink RR_Lyrae_variable.
- BL_Boötis wikiPageWikiLink Solar_mass.
- BL_Boötis wikiPageWikiLink W._M._Keck_Observatory.
- BL_Boötis wikiPageWikiLinkText "BL Boötis".
- BL_Boötis appmagV "14.45".
- BL_Boötis constell Boötes.
- BL_Boötis dec "+28° 29′ 12′".
- BL_Boötis epoch "J2000".
- BL_Boötis ra "50440.4".
- BL_Boötis simbad "BL+Boo".
- BL_Boötis wikiPageUsesTemplate Template:Reflist.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_begin.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_character.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_end.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_observe.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_reference.
- BL_Boötis wikiPageUsesTemplate Template:Starbox_sources.
- BL_Boötis wikiPageUsesTemplate Template:Stars_of_Boötes.
- BL_Boötis subject Category:Boötes_(constellation).
- BL_Boötis subject Category:Cepheid_variables.
- BL_Boötis subject Category:Objects_named_with_variable_star_designations.
- BL_Boötis hypernym Star.
- BL_Boötis type CelestialBody.
- BL_Boötis type Place.
- BL_Boötis type Star.
- BL_Boötis type Location.
- BL_Boötis type Place.
- BL_Boötis type Thing.
- BL_Boötis comment "BL Boötis (abbreviated to BL Boo) is a pulsating variable star in the constellation Boötes. It varies from magnitude 14.45 to 15.10 over 0.82 days. It is located 4 arcminutes from the centre of (and assumed to be a member star of) the globular cluster NGC 5466. Its variability was first noted in 1961 by Russian astronomer Nikolaĭ Efimovich Kurochkin, who gave it the variable star designation BL Boötis. However, he thought it was an eclipsing binary.".
- BL_Boötis label "BL Boötis".
- BL_Boötis sameAs Q17510135.
- BL_Boötis sameAs m.011l2ljc.
- BL_Boötis sameAs Q17510135.
- BL_Boötis wasDerivedFrom BL_Boötis?oldid=703429824.
- BL_Boötis isPrimaryTopicOf BL_Boötis.
- BL_Boötis name "BL Boötis".