J/AJ/157/111ivo://CDS.VizieR/J/AJ/157/111doi:10.26093/cds/vizier.51570111CDSYang Y.Yuan H.Dai H.2019-07-15T11:28:16Z2019-07-05T08:07:23ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsearly-type-starsvisible-astronomyspectroscopyinfrared-astronomyThree eclipsing binaries, CT Tau, GU Mon, and V701 Sco, are early-type contact binaries with infrared excess from circumbinary matter. We present the multi-color photometry for CT Tau and GU Mon, whose spectral types of B1V are identified by the low-precision spectra. Combining these new light curves (LCs) with previously reported LCs and radial velocity curves, we perform a synthesized analysis to estimate/update the stellar absolute parameters of the three systems. Their mass ratios are close to unity (i.e., q~1), which indicates that the binary system comprising of twin components may be undergoing a slow Case A mass transfer. From the period analysis, the light-time orbit in the (O-C) curve may result from the third condense companion around the binary system although no evidence could be provided by the third light l_3_. From the spectral energy distribution for three binaries, the excess infrared (IR) emissions are above the photospheric emissions, which can be seen at the 22.1 {mu}m for CT Tau and GU Mon, and 11.6 {mu}m, 14.5 {mu}m, and 22.1 {mu}m for V701 Sco, respectively. This kind of infrared excess for the early-type star may be attributed to the circumbinary matter by stellar wind.2019AJ....157..111Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/157/111CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)J/A+A/590/A45 : GU Mon BV light curves (Lorenzo+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/157/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/157/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/157/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/157/111https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/157/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/157/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/157/111/table4All available light minimum times for three eclipsing binariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStellar identifiermeta.id;meta.maincharHJD[2427688.268/2458082.4029] Heliocentric Julian Datedtime.epochdoublee_HJD[0.0001/0.042]? Uncertainty in HJDdstat.error;time.epochfloatnullableMethDetection method (1)meta.code;obscharEpoch[-28450/15789.5] Epoch numbermeta.iddoubleType[I] Eclipse typemeta.notechar(O-C)i[-0.1566/0.0992] Initial residuals (2)dstat.fit.residualfloat(O-C)f[-0.1672/0.0431]? Final residualsdstat.fit.residualfloatnullablef_(O-C)f[d] Indicates the (O-C)f is discardedmeta.codecharJ/AJ/157/111/table6Measured fluxes for the three eclipsing binariesBandBandinstr.bandpassStarStellar identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[0.353/22.1] Wavelength {lambda}umem.wlfloatFlux[0.184/149] Flux density0.01Jyphot.fluxfloate_Flux[0.014/5.1]? Uncertainty in Flux0.01Jystat.error;phot.fluxfloatnullablen_Flux[a] Note on Flux (1)meta.notecharRefReferencemeta.ref;pos.framecharBibcodeBibcode of the referencemeta.bib.bibcodecharCatCatalog reference in VizieRmeta.id;meta.datasetchar