J/AJ/132/1910ivo://CDS.VizieR/J/AJ/132/1910doi:10.26093/cds/vizier.51321910CDSFekel F.C.Henry G.W.Barlow D.J.Pourbaix D.2017-06-27T06:38:57Z2008-11-04T21:54:26ZCDS support team

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

cds-question@unistra.frmultiple-starsradial-velocityinfrared-photometryvisible-astronomyphotometryOur red-wavelength spectroscopic observations of HD 131861, a previously known single-line multiple system, span 20 years. Now lines of two components, the short-period F5 V primary and G8 V secondary, have been detected. The inner orbit is circular with a period of 3.5507439-days, while the outer orbit of the system has a period of 1642 days or 4.496-yr and a relatively low eccentricity of 0.10. Analysis of the Hipparcos data produces a well-determined astrometric orbit for the long-period system that has an inclination of 52{deg}. Our photometric observations show shallow primary and secondary eclipses of the short-period pair, and eclipse solutions result in an inclination of 81{deg}. Thus, the long- and short-period orbits are not coplanar. The mass of the unseen third component is 0.7M_{dot}_, corresponding to a mid-K dwarf. The total mass of the system, 3.08M_{dot}_, leads to a semimajor axis of 4AU for the outer orbit. The F5 V primary is rotating more slowly than it would if it were synchronously rotating, while the G8 V secondary may be synchronously rotating. The lithium abundance of the F5 V primary is similar to the initial lithium abundance found for Population I dwarfs and so indicates no significant dilution.2006AJ....132.1910Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/1910CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/132/1910https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/132/1910http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/132/1910https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/132/1910https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/132/1910http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/132/1910GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/132/1910/table1Radial velocities of HD 131861recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoublen_HJD[b] b: Lithium region ({lambda}=6700{AA})meta.notecharphiL[0/1] Phase in the long-period orbittime.phasefloatphiS]0/1[ Phase in the short-period orbittime.phasefloatRVAaAa component radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloat(O-C)AaAa component observed minus Computer radial velocitykm/sphys.veloc;arith.difffloatRVAb? Ab component radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablen_RVAb[a] a: 3{sigma} residual, velocity given zero weight.meta.notechar(O-C)Ab? Ab component Observed minus Computer radial velocitykm/sphys.veloc;arith.difffloatnullableObsOnservatory (HPO or KPNO)meta.id;instr.obstycharJ/AJ/132/1910/table2Photometric observations of HD 131861recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleDV(V-C)? Var-Comp differential V magnitude (1)magphot.mag;arith.difffloatnullableDR(V-C)? Var-Comp differential R magnitude (1)magphot.mag;arith.difffloatnullableDI(V-C)? Var-Comp differential I magnitude (1)magphot.mag;arith.difffloatnullableDV(Ck-C)? Check-Comp differential V magnitude (1)magphot.mag;arith.difffloatnullableDR(Ck-C)? Check-Comp differential R magnitude (1)magphot.mag;arith.difffloatnullableDI(Ck-C)? Check-Comp differential I magnitude (1)magphot.mag;arith.difffloatnullable