J/AJ/143/34ivo://CDS.VizieR/J/AJ/143/34doi:10.26093/cds/vizier.51430034CDSLee J.W.Lee C.-U.Kim S.-L.Kim H.-I.Park J.-H.2017-06-26T11:49:50Z2013-04-16T07:14:56ZCDS 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-photometryMultiband CCD photometric observations of SZ Her were obtained between 2008 February and May. The light curve was completely covered and indicated a significant temperature difference between both components. The light-curve synthesis presented in this paper indicates that the eclipsing binary is a classical Algol-type system with parameters of q=0.472, i=87.57{deg}, and {Delta}(T_1_-T_2_)=2381K; the primary component fills approximately 77% of its limiting lobe and is slightly larger than the lobe-filling secondary component. More than 1100 times of minimum light spanning more than a century were used to study an orbital behavior of the binary system. It was found that the orbital period of SZ Her varied due to a combination of two periodic variations with cycle lengths of P_3_=85.8yr and P_4_=42.5yr and semi-amplitudes of K_3_=0.013days and K_4_=0.007days, respectively. The most reasonable explanation for these variations is a pair of light-time effects driven by the possible existence of two M-type companions with minimum masses of M_3_=0.22M_{sun}_ and M_4_=0.19M_{sun}_ that are located close to the 2:1 mean motion resonance. If two additional bodies exist, then the overall dynamics of the multiple system may provide a significant clue to the formation and evolution of the eclipsing pair.2012AJ....143...34Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/34CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/124 : Approximate elements of eclipsing binaries (Svechnikov+, 1990)V/115 : Semi-detached eclipsing binaries (Surkova+, 2004)J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)J/other/IBVS/5543 : 163-nd list of minima of EBs (Diethelm+, 2004)J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)J/MNRAS/370/2013 : Catalogue of close binaries (Soydugan+, 2006)J/MNRAS/379/1665 : XX Cep BVRI light curves (Lee+, 2007)J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)J/AJ/139/2669 : CL Aur BVRI light curves (Lee+, 2010)J/MNRAS/407/497 : BVRI light curves of KZ Pav (Surgit+, 2010)J/AJ/142/12 : WZ Cyg BVRI light curves (Lee+, 2011)J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)J/other/IBVS/5959 : Minima and maxima of 436 variables (Huebscher+, 2011)J/other/JAVSO/39.23 : Maxima of short period pulsating stars (Samolyk+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/34https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/143/34/table2CCD photometric observations of SZ HerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-B? B band Heliocentric Julian Date observationsdtime.epochdoublenullableDBmag[-0.575/1.48]? Differential B band magnitudemagphot.mag;em.opt.B;arith.difffloatnullableHJD-V? V band Heliocentric Julian Date observationsdtime.epochdoublenullableDVmag[0.032/1.833]? Differential V band magnitudemagphot.mag;em.opt.V;arith.difffloatnullableHJD-RR band Heliocentric Julian Date observationsdtime.epochdoubleDRmag[0.372/1.991] Differential R band magnitudemagphot.mag;em.opt.R;arith.difffloatHJD-I? I band Heliocentric Julian Date observationsdtime.epochdoublenullableDImag[0.678/2.123]? Differential I band magnitudemagphot.mag;em.opt.I;arith.difffloatnullableJ/AJ/143/34/table5New times of minimum light for SZ HerMin[I II] Type of minimumphot.mag;stat.minnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of minimum (HJD-2450000)dtime.epochdoublen_HJD[a] Origin of minimum (1)meta.notechare_HJDUncertainty on HJDdstat.error;time.epochdouble