J/AJ/151/124ivo://CDS.VizieR/J/AJ/151/124doi:10.26093/cds/vizier.51510124CDSYang Y.-G.Dai H.-F.Zhou Z.Li Q.2017-06-26T11:49:03Z2016-07-28T17:11:52ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryccd-photometryWe present multi-color photometric observations for two neglected near-contact binaries, IZ Mon (P=0.77980^d^) and AR Dra (P=0.67584^d^). By the aid of the updated W-D analysis code, the photometric solutions were deduced from the multi-color light curves (LCs). IZ Mon is a semi-detached binary with a mass ratio of q=0.388(+/-0.002) , while AR Dra is a detached star with a mass ratio of q=0.652(+/-0.002). The asymmetric LCs of IZ Mon were modeled by a hot spot on the secondary's surface, which may be attributed to mass transfer from the primary. Based on all collected eclipse times for two systems, we constructed their timing residual curves. The orbital period for IZ Mon may be continuously decreasing at a rate of dP/dt=-2.06(+/-0.04)days/yr, which may result from mass and angular momentum loss from the central system. For AR Dra, there exists a cyclic variation with a period of P_3_=104.9(+/-2.9)yr due to light-time orbit effect via the presence of the third body, whose mass is more than 0.28(+/-0.02)M_{Sun}_. Finally, two near-contact binaries, IZ Mon and AR Dra, will evolve into contact binaries.2016AJ....151..124Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/AJ/147/145 : Algol-type binaries. VIII. DI Peg & AF Gem (Yang+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/124https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/124/table6 (Estimated absolute parameters for IZ Mon and AR Dra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/124/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/124/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/124/table6?GETtext/xml+votable180.050000true105.18685428.81751670.0055555555555555566/11261 224362.762881831355591e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/151/124?format=asciiInfraredOpticaldefaultJ/AJ/151/124/table6Estimated absolute parameters for IZ Mon and AR DrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (IZ Mon or AR Dra)meta.id;meta.maincharSep[4.19/5.22] Separation between components (a)solRadpos.distance;src.orbitalfloate_Sep[0.03/0.05] Uncertainty in SepsolRadstat.errorfloatMass1[1.31/2.01] Absolute mass of primarysolMassphys.massfloate_Mass1[0.03/0.06] Uncertainty in Mass1solMassstat.errorfloatRad1[1.47/2.48] Absolute radius of primarysolRadphys.size.radiusfloate_Rad1[0.05/0.13] Uncertainty in Rad1solRadstat.errorfloatLum1[3.58/28.7] Absolute luminosity of primarysolLumphys.luminosityfloate_Lum1[0.24/2.9] Uncertainty in Lum1solLumstat.errorfloatMass2[0.78/0.85] Absolute mass of secondarysolMassphys.massfloate_Mass2[0.02/0.02] Uncertainty in Mass2solMassstat.errorfloatRad2[1.44/1.49] Absolute radius of secondarysolRadphys.size.radiusfloate_Rad2[0.05/0.09] Uncertainty in Rad2solRadstat.errorfloatLum2[1.04/1.22] Absolute luminosity of secondarysolLumphys.luminosityfloate_Lum2[0.07/0.14] Uncertainty in Lum2solLumstat.errorfloatPer[0.675837/0.779808] Period (from the text)dtime.perioddoublePhotSimbad column added by the CDSmeta.numberintnullableMinSimbad column added by the CDSmeta.numberintnullableGCVSDisplay the data from the General Catalogue of Variable Stars (cat. B/gcvs)meta.ref.urlcharLCLight Curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from SIMBAD astronomical database (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD astronomical database (declination part)degpos.eq.dec;meta.mainJ/AJ/151/124/table1Photometric observations for IZ Mon and AR DrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (IZ Mon or AR Dra) (1)meta.id;meta.maincharHJD-BHeliocentric Julian Date of B band datadtime.epochdoubleDBmag[0.5/2.2] Differential Johnson B band magnitude (2)magphot.mag;em.opt.B;arith.difffloatHJD-V? Heliocentric Julian Date of V band datadtime.epochdoublenullableDVmag[0.68/2.1]? Differential Johnson V band magnitude (2)magphot.mag;em.opt.V;arith.difffloatnullableHJD-R? Heliocentric Julian Date of R band datadtime.epochdoublenullableDRmag[0.76/1.98]? Differential Cousins R band magnitude (2)magphot.mag;em.opt.R;arith.difffloatnullableJ/AJ/151/124/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/73] Reference numbermeta.id;meta.mainintprimaryBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/151/124/table2New observed light minimum timesNameStar name (IZ Mon or AR Dra)meta.id;meta.maincharMinMinimum type (I or II)meta.codenullableFlt[BVR] Filter (B, V, or R)meta.id;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublee_HJDUncertainty in HJDdstat.error;time.epochdoubleJ/AJ/151/124/starsPreviously published and new eclipsing times for IZ Mon , and for AR DrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEpoch[-23848/36691] Epochtime.epochdoubleMethObservation method (p, pe, pv, vi, or CCD) (1)meta.code;obscharMinMinimum type (I or II)meta.codenullableO-C0[-0.13/0.054] Initial timing residual (O-C)_i_ (2)stat.fit.residualfloatO-C1[-0.063/0.055] Final timing residual (O-C)_f_stat.fit.residualfloatRef[1/73] Reference code; in refs.dat filemeta.noteint