J/AJ/150/9ivo://CDS.VizieR/J/AJ/150/9doi:10.26093/cds/vizier.51500009CDSXiang F.-Y.Xiao T.-Y.Zhang B.Shi X.-D.2017-07-12T06:59:54Z2015-09-17T09:16:23ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryBy analyzing R_c_ and I_c_light curves of the short-period solar-type eclipsing binary GSC 1537-1557 we discovered that it is a shallow contact binary with a degree of contact factor of f=(8.1+/-1.79)%. Photometric solutions reveal that GSC 1537-1557 is a W-type system with a mass ratio of q=M_2_/M_1_=2.645 where the less massive component (the primary star) is about 110K hotter than the more massive one (the secondary star). The asymmetry and variation of the light curves were explained as the activity of spots on the solar-type component stars. By investigating all of the available times of light minima, we found that the observed-calculated (O-C) curve shows a cyclic variation with a small amplitude of 0.00335days and a period of 8.1years. The small-amplitude cyclic change in the O -C curve was analyzed for the light-travel time effect via the presence of an extremely cool stellar companion. The mass of the third body was determined to be M_3_sini'=(0.19+/-0.01)M_{sun}_ when M_1_+M_2_=1.31M_{sun}_ is adopted for GSC 1537-1557. The semimajor axis of the outer obit is a'sini'=(4.58+/-0.33)AU.2015AJ....150....9Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/9CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/other/IBVS/5543 : 163-nd list of eclipsing binaries minima (Diethelm+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/9https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/150/9/table8*CCD photometric data of GSC 1537-1557 in V bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFltFilter used in the observation (Johnson-Cousins V, R_c_, I_c_)instr.setup;obsHJDHeliocentric Julian Date (HJD-2400000)dtime.epochdoublePhase[0/1] Phase (G1)time.phasefloatDmag[-0.371/0.457] Differential magnitude in Filtermagphot.mag;arith.difffloatJ/AJ/150/9/table2All available times of light minimum for GSC 1537-1557O-C3[-0.004/0.003] The (O-C)_2_ value from Eq.(3)dtime;arith.difffloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublee_HJDError in HJDdstat.error;time.epochfloatMeth[CCD] Methodmeta.code;obscharE[-2699/10443] Epoch (cycle number)meta.number;time.periodfloatO-C2[-0.005/0.010] The (O-C)_1_ value from Eq.(2)dtime;arith.difffloatRes[-0.0011/0.0012] Residualdtime;arith.difffloatRefReferencemeta.ref;pos.framecharJ/AJ/150/9/table1New times of light minimum for GSC 1537-1557recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublee_HJDError in HJDdstat.error;time.epochdoubleE[6290/10443] Epoch (cycle number)meta.number;time.periodfloatFltFilter used in the observation (Johnson-Cousins V, R_c_, I_c_) (1)instr.setup;obsTelTelescope (60cm, 85cm, or 1.0m) (2)meta.id;instr.telcharJ/AJ/150/9/photometryCCD photometry of GSC 1537-1557 in R_c_ band , and in I_c_ bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFltFilter (Johnson-Cousins Rc or Ic)meta.code;instr.filterHJDHeliocentric Julian Date (HJD-2400000)dtime.epochdoublePhase[0/1] Phase (G1)time.phasefloatDmag[-0.396/0.326] Differential magnitudemagphot.mag;arith.difffloat