J/AJ/148/126ivo://CDS.VizieR/J/AJ/148/126doi:10.26093/cds/vizier.51480126CDSCaliskan S.Latkovic O.Djurasevic G.Ozavci I.Basturk O.Cseki A.,Senavci H.V.Kilicoglu T.Yilmaz M.Selam S.O.2017-10-18T08:24:01Z2014-12-16T15:33:28ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsccd-photometryinfrared-photometryvisible-astronomyWide-band photometryWe analyze new, high quality multicolor light curves of four overcontact binaries: AK Her, HI Dra, V1128 Tau, and V2612 Oph, and determine their orbital and physical parameters using the modeling program of G. Djurasevic and recently published results of radial velocity studies. The achieved precision in absolute masses is between 10% and 20%, and the precision in absolute radii is between 5% and 10%. All four systems are W UMa-type binaries with bright or dark spots indicative of mass and energy transfer or surface activity. We estimate the distances and the ages of the systems using the luminosities computed through our analysis, and perform an O-C study for V1128 Tau, which reveals a complex period variation that can be interpreted in terms of mass loss/exchange and either the presence of the third body, or the magnetic activity on one of the components. We conclude that further observations of these systems are needed to deepen our understanding of their nature and variability.2014AJ....148..126Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/148/126CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)V/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)J/AJ/145/80 : Light curves of HS Aqr, EG Cep, VW LMi, DU BooJ/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)J/AJ/137/3655 : Radial velocities of 8 close binaries (Pribulla+, 2009)J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)J/AJ/132/769 : Radial velocities of 10 close binaries (Pribulla+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/148/126https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/148/126http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/148/126https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/148/126https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/148/126http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/148/126GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/148/126/table1 (Summary of observational aspects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/126/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/126/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/126/table1?GETtext/xml+votable180.050000true258.49093516.35016920.0055555555555555566/263 15329 31812 32307https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/148/126?format=asciiOpticalInfrareddefaultJ/AJ/148/126/table3BVRI photometry of AK Her, HI Dra, V1128 Tau, V2612 OphrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (AK Her, HI Dra, V1128 Tau, V2612 Oph)meta.id;meta.maincharprimaryFlt[BVRI] Filter used (Johnson-Cousins B, V, R or I)instr.setup;instr.filtercharHJDHeliocentric Julian Date of observationdtime.epochdoublePhase[0/1] Phasetime.phasefloatDmag[-1.2/1.168] Differential magnitude in Filtermagphot.mag;arith.difffloatJ/AJ/148/126/table1Summary of observational aspectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryCNameName of the comparison starmeta.idcharsig.BStandard deviation of the B light curve residualmagstat.fit.residual;phot.mag;em.opt.Bfloatsig.VStandard deviation of the V light curve residualmagstat.fit.residual;phot.mag;em.opt.Vfloatsig.RStandard deviation of the R light curve residualmagstat.fit.residual;phot.mag;em.opt.Rfloatsig.I? Standard deviation of the I light curve residualmagstat.fit.residual;phot.mag;em.opt.IfloatnullableT0Epoch of minimumdtime.epochdoublee_T0Error in HJDdstat.errorfloatPerOrital perioddtime.perioddoublee_PerError in Perdstat.errordoubleLCShow the light curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main