J/AJ/146/35ivo://CDS.VizieR/J/AJ/146/35doi:10.26093/cds/vizier.51460035CDSYang Y.-G.Qian S.-B.Zhang L.-Y.Dai H.-F.Soonthornthum B.2026-03-18T11:47:28Z2026-03-18T12:47:17ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyWide-band photometryNew multi-color photometry for the eclipsing binary DZ Psc was performed in 2011 and 2012 using the 85cm telescope at the Xinglong Station of the National Astronomical Observatories of China. Using the updated Wilson-Devinney (W-D) code, we deduced two sets of photometric solutions. The overcontact degree is f=89.7(+/-1.0)%, identifying DZ Psc as a deep, low mass ratio overcontact binary. The asymmetric light curves (i.e., LC_2_ in 2012) were modeled by a hot spot on the primary star. Based on all of the available light minimum times, we discovered that the orbital period of DZ Psc may be undergoing a secular period increase with a cyclic variation. The modulated period and semi-amplitude of this oscillation are P_mod_=11.89(+/-0.19)yr and A=0.0064(+/-0.0006)days, which may be possibly attributed to either cyclic magnetic activity or light-time effect due to the third body. The long-term period increases at a rate of dP/dt=+7.13(+/-0.17)*10^-7^days/yr, which may be interpreted as conserved mass transfer from the less massive component to the more massive one. With mass transferring, DZ Psc will finally merge into a rapid-rotation single star when J_spin_/J_orb_>1/3.2013AJ....146...35Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/146/35CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)J/AJ/143/122 : VR light curves of CK Boo (Yang+, 2012; Paper XII)J/AJ/141/44 : V396 Mon BVRI light curves (Liu+, 2011)J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)J/AJ/131/621 : A catalog of 1022 bright contact binary stars (Gettel+, 2006)J/AJ/130/2252 : VRI photometry of V410 Aur (Yang+, 2005; Paper IV)J/AJ/143/122 : VR light curves of CK Boo (Yang+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/146/35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/146/35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/146/35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/146/35https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/146/35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/146/35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/146/35/lcurveCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-B? Heliocentric Julian Date of B band observationdtime.epochdoublenullableDBmag? Differential B band magnitudemagphot.mag;arith.difffloatnullableHJD-VHeliocentric Julian Date of V band observationdtime.epochdoubleDVmagDifferential V band magnitudemagphot.mag;arith.difffloatHJD-R? Heliocentric Julian Date of R band observationdtime.epochdoublenullableDRmag? Differential R band magnitudemagphot.mag;arith.difffloatnullableJ/AJ/146/35/table3Newly obtained eclipsing times for DZ PscrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNe[1/19] Eclipse numbermeta.idintHJDHeliocentric Julian Date (1)dtime.epochdoublee_HJDUncertainty on HJDdstat.error;time.epochdoubleMin[I /II] Type of minimum (I=primary, II=secondary)meta.codenullableFlt[BVRI] Filter (B, V, R or I)meta.id;instr.filtercharJ/AJ/146/35/table4All available light minimum times of DZ PscrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleEEclipse number (.5 for secondary minimum)meta.id;meta.maindoubleMethDetection method (vi=visual, pe=photoelectric, CCD)meta.code;obscharMin[I /II] Type of minimum (I=primary, II=secondary)meta.codenullableO-C1The (O-C)_1_ residual (1)dstat.fit.residualfloatO-C2The (O-C)_2_ residual (2)dstat.fit.residualfloatO-C? Final residualdstat.fit.residual;phys.atmol.finalfloatnullableRef[1/13] Reference; in refs.dat filemeta.ref;pos.frameintJ/AJ/146/35/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/13] Reference numbermeta.id;meta.mainintprimaryBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar