J/AJ/134/179ivo://CDS.VizieR/J/AJ/134/179doi:10.26093/cds/vizier.51340179CDSYang Y.-G.Dai J.-M.Yin X.-G.Xiang F.-Y.2023-12-21T15:48:56Z2009-10-30T12:36:11ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starsphotometryWe present a detailed period analysis of TY Bootis, based on all available light minimum times covering about 80 years. We discovered that there exists a cyclic variation overlaying a secular period decrease from the distorted (O-C) diagram. A long-term decrease with a sinusoidal oscillation (i.e., eq. (2)) or with a light-time effect (i.e., eq. (3)) may be reasonable due to the smaller difference between their sum of residuals. The sinusoidal change with a period of 59.7 yr for equation (2) can be attributed to either a light-time effect or cyclic magnetic activity of both components. For the assumed third body, the period and eccentricity of the light-time orbit are P_3_=58.6yr and e'=0.1744, respectively. If the existence of an additional unseen body is true, this binary may be a tertiary system. The long-term orbital period decrease suggests that TY Boo is undergoing a mass transfer from the primary component to the secondary component at a rate of dm/dt=-3.15x10^-8^M_{sun}_/yr for equation (2) or dm/dt=-2.90x10^-8^M_{sun}_/yr for equation (3). As its mass transfers, accompanied by angular momentum loss due to mass outflow L_2_, this binary will evolve into a deep contact configuration.2007AJ....134..179Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/134/179CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/134/179https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/134/179http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/134/179https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/134/179https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/134/179http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/134/179GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/134/179/table1All available light minimum times for TY BootisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of minimumdtime.epochdoubleEpochEpoch E (in periods)time.epochdoubleMethodMethod used (1)meta.code;obscharMin[I II] Primary (I) or secondary (II) minimummeta.codechar(O-C)(O-C) residual with Kreiner ephemeris 2001: 2447612.6035+0.31714910E (Eq.1)stat.fit.residual;time.epoch;stat.fit.omcfloat(O-C)1(O-C)_1_ residual with parabolic curve (Eq.2)stat.fit.residualfloat(O-C)2(O-C)_2_ residual with 3rd body (Eq.3)stat.fit.residualfloatRefReference, in refs.dat filemeta.ref;pos.frame;meta.fileintJ/AJ/134/179/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCodeReference codemeta.noteintRefReferencemeta.ref;pos.framechar