J/AJ/152/57ivo://CDS.VizieR/J/AJ/152/57doi:10.26093/cds/vizier.51520057CDSDjurasevic G.Essam A.Latkovic O.Cseki A.El-Sadek M.A.,Abo-Elala M.S.Hayman Z.M.2018-01-04T08:21:49Z2016-09-23T06:08:02ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometryWe present new, high-quality multicolor observations of four recently discovered contact binaries, 1SWASP J064501.21+342154.9, 1SWASP J155822.10-025604.8, 1SWASP J212808.86+151622.0, and UCAC4 436-062932, and analyze their light curves to determine orbital and physical parameters using the modeling program of G. Djurasevic. In the absence of spectroscopic observations, the effective temperatures of the brighter components are estimated from the color indices, and the mass ratios are determined with the q-search method. The analysis shows that all four systems are W UMa type binaries in shallow contact configurations, consisting of late-type main-sequence primaries and evolved secondaries with active surface regions (dark or bright spots) resulting from magnetic activity or ongoing transfer of thermal energy between the components. We compare the derived orbital and stellar parameters for these four variables with a large sample of previously analyzed W UMa stars and find that our results fit it well.2016AJ....152...57Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/57CatalogResearchIsServedByTAP 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)I/322 : UCAC4 Catalogue (Zacharias+, 2012)I/297 : NOMAD Catalog (Zacharias+ 2005)V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)V/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)J/AJ/148/126 : Light curves of 4 overcontact binaries (Caliskan+, 2014)J/A+A/525/A66 : 4 close binaries BVR light curves (Djurasevic+, 2011)J/other/PASA/23.154 : Light curves of XY Leo, EE Cet, AQ Psc (Djurasevic+ 2006)J/A+A/415/283 : BV light curves of NN Vir (Djurasevic+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/57https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/57/table1 (Summary of observational aspects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/57/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/57/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/57/table1?GETtext/xml+votable180.050000true101.255041734.365250.0055555555555555566/6671 12587 31263https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/57?format=asciiInfraredOpticaldefaultJ/AJ/152/57/table3BVRI photometry of J0645, J1558, J2128, and UCAC4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identifier (1)meta.id;meta.maincharFlt[VRI] Filter used in the observation (Johnson-Cousins V, R or I)instr.setup;obscharHJDHeliocentric Julian Date of observationdtime.epochdoubledmag[-0.49/3.1] Differential magnitude in filter (variable minus comparison)magphot.mag;arith.diffdoublee_dmag[0.0018/0.28] Standard deviation in dmagmagstat.error;phot.magdoubleJ/AJ/152/57/table1Summary of observational aspectsSimbadNameSimbad column added by the CDSmeta.idcharPer[0.22/0.37]? Orbital period (2)dtime.perioddoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNphotNumber of photometric measurements (table3)meta.numberintnullableObjectStar short namemeta.idcharStarStar role (Variable, Comparison, or Check)meta.codecharNameStar name (1)meta.id;meta.maincharONameOther name (1)meta.idcharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainBmag[13.2/16.2] The B-band magnitude (1)magphot.mag;em.opt.BfloatVmag[12.3/15.1] The V-band magnitude (1)magphot.mag;em.opt.VfloatUCAC4Display the data from the UCAC4 catalog (Zacharias et al. 2012, Cat. I/322) within 1.5''meta.ref.urlcharNOMADDisplay the data from the NOMAD catalog (Zacharias et al. 2005, Cat. I/297) within 1.5''meta.ref.urlcharLCLight Curvemeta.ref.urlchar