J/ApJ/700/1349ivo://CDS.VizieR/J/ApJ/700/1349doi:10.26093/cds/vizier.17001349CDSTorres G.Claret A.Young P.A.2017-06-27T06:38:14Z2011-09-07T11:21:30ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsradial-velocityinterferometryWe report extensive radial velocity measurements of the two giant components of the detached, 104 day period binary system of Capella. Our highly accurate three-dimensional orbital solution based on all existing spectroscopic and astrometric observations including our own yields much improved masses for the primary and secondary of 2.466+/-0.018M_{sun}_ and 2.443+/-0.013M_{sun}_, with relative errors of only 0.7% and 0.5%, respectively. The mass ratio is considerably closer to unity than previously believed, which has an impact on assessing the evolutionary state of the system. Improved values are presented also for the radii (11.87+/-0.56R_{sun}_ and 8.75+/-0.32R_{sun}_), effective temperatures (4920+/-70K and 5680+/-70K), and luminosities (79.5+/-4.8L_{sun}_ and 72.1+/-3.6L_{sun}_). The distance is determined to be 13.042+/-0.028pc, based on the accurate orbital parallax. The projected rotational velocities and individual rotation periods are also known. Capella is unique among evolved stars in that, in addition to all of the above, the chemical composition is known as well.2009ApJ...700.1349Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/700/1349CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/531/A89 : Spectroscopic orbit of Capella (Weber+, 2011)J/A+A/422/627 : Nearby multiple stars speckle interferometry (Balega+, 2004)J/ApJS/131/561 : Double stars with PISCO at Pic du midi (Scardia+, 2000)J/AJ/119/3084 : ICCD speckle obs. of binary stars. XXIII. (Hartkopf+, 2000)J/AJ/117/548 : 1997 WIYN binary stars speckle observations (Horch+, 1999)J/AJ/106/1639 : Speckle observations of binary stars (McAlister+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/700/1349https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/700/1349http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/700/1349https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/700/1349https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/700/1349http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/700/1349GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/700/1349/table7Hipparcos measurements of Capella and corresponding O-C residualsHJDHeliocentric Julian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJYrJulian yearyrtime.epochdoubleDelVAbscissa residual measurementmasstat.fit.residualfloate_DelVThe 1{sigma} error in DelVmasstat.errorfloat(O-C)VAbscissa residual (O-C) residualmasstat.fit.residualfloatPhaseOrbital phasetime.phasefloatJ/ApJ/700/1349/table3Historical radial velocity measurements of the primary component of CapellaPhaseOrbital phasetime.phasefloat(O-C)APrimary (O-C) residualkm/sstat.fit.residualfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleJYrJulian yearyrtime.epochdoubleRVAPrimary radial velocitykm/sspect.dopplerVelocfloate_RVAThe 1{sigma} error in RVAkm/sstat.errorfloatRefSource reference (see refs.dat file)meta.ref;pos.frameintJ/ApJ/700/1349/table1CfA radial velocity measurements of CapellarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleJYrJulian year of observationyrtime.epoch;obsdoubleRVAPrimary radial velocitykm/sspect.dopplerVelocfloatRVBSecondary radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVAThe 1{sigma} error in RVAkm/sstat.errorfloate_RVBThe 1{sigma} error in RVBkm/sstat.errorfloat(O-C)APrimary (O-C) residualkm/sstat.fit.residualfloat(O-C)BSecondary (O-C) residualkm/sstat.fit.residualfloatPhaseOrbital phasetime.phasefloatJ/ApJ/700/1349/refsReferencesRefReference numbermeta.id;meta.mainintprimaryBibCodeBibcodemeta.bib.bibcodecharAutAuthor's name(s)meta.bib.authorcharCommCommentmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/ApJ/700/1349/table6Speckle and imaging measurements of CapellarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleJYrJulian yearyrtime.epochdoubletheta? Position angledegpos.posAngfloatnullablee_theta? The 1{sigma} error in thetadegstat.error;pos.posAngfloatnullablerho? Angular separationmaspos.angDistancefloatnullablee_rho? The 1{sigma} error in rhomasstat.errorfloatnullable(O-C)t? The position angle (O-C) residualdegstat.fit.residualfloatnullable(O-C)r? The angular separation (O-C) residualmasstat.fit.residualfloatnullablePhaseOrbital phasetime.phasefloatRefSource reference (see refs.dat file)meta.ref;pos.frameintJ/ApJ/700/1349/table5Interferometric measurements of Capella published in Cartesian coordinatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleJYrJulian yearyrtime.epochdoubleDelXRelative X separationmaspos.angDistancefloate_DelXThe 1{sigma} error in DelXmasstat.errorfloatDelYRelative Y separationmaspos.angDistancefloate_DelYThe 1{sigma} error in DelYmasstat.errorfloat(O-C)XRelative X separation (O-C) residualstat.fit.residualfloat(O-C)YRelative Y separation (O-C) residualstat.fit.residualfloatPhaseOrbital phasetime.phasefloatRefSource reference (see refs.dat file)meta.ref;pos.frameintJ/ApJ/700/1349/table4Interferometric measurements of Capella published in polar coordinatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleJYrJulian yearyrtime.epochdoubletheta? Position angledegpos.posAngfloatnullablee_theta? The 1{sigma} error in thetadegstat.error;pos.posAngfloatnullablerho? Angular separationmaspos.angDistancefloatnullablee_rho? The 1{sigma} error in rhomasstat.errorfloatnullable(O-C)t? The position angle (O-C) residualdegstat.fit.residualfloatnullable(O-C)r? The angular separation (O-C) residualmasstat.fit.residualfloatnullablePhaseOrbital phasetime.phasefloatRefSource reference (see refs.dat file)meta.ref;pos.frameint