J/AJ/170/214ivo://CDS.VizieR/J/AJ/170/214CDSPoro A.Li K.Michel R.Wang L.-H.Alicavus F.Najera M.R.,Santillan-Ortega P.Tamayo F.J.Aceves H.2026-07-15T14:28:42Z2026-07-15T14:49:16ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsmultiple-starsinfrared-photometryvisible-astronomybroad-band-photometryThis study provides the first comprehensive analysis of eight total-eclipse W Ursae Majoris-type contact binary systems. Ground-based photometric multiband observations were conducted at a Mexican observatory, and new times of minima were extracted. The O-C analysis reveals that four of our target binaries exhibit a long-term increase in their orbital periods, while the others show a long-term decrease in their orbital periods. We analyzed the light curves using the PHOEBE Python code and BSN application. Among the target systems, two required the inclusion of a cold starspot on one of the components to achieve an adequate fit. The light curve analysis revealed that the target systems exhibit a shallow fillout factor. Absolute parameters were estimated using the Gaia DR3 parallax and astrophysics equations. Considering the effective temperatures and component masses, each system was classified as either the A- or W-subtype. The stellar evolution of the systems was represented through the mass-radius and mass-luminosity diagrams. Additionally, we calculated the initial masses of the companion stars and the total mass lost for each target system.2025AJ....170..214Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/214CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)II/287 : Northern Sky Variability Survey (NSVS) (Wozniak+, 2004)II/328 : AllWISE Data Release (Cutri+ 2013)II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)J/A+AS/141/371 : Low-mass stars evolut. tracks & isochrones (Girardi+, 2000)J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)J/AJ/131/621 : A catalog of 1022 bright contact binary stars (Gettel+, 2006)J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)J/AJ/146/101 : LINEAR. III. Catalog of periodic variables (Palaversa+, 2013)J/MNRAS/430/2029 : Initial masses of W UMa type contact binar. (Yildiz+, 2013)J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/AJ/153/231 : BVR photometry of EPIC 211957146 (Sriram+, 2017)J/ApJS/237/28 : WISE catalog of periodic variable stars (Chen+, 2018)J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)J/AJ/159/189 : Eclipse timings for 9 contact binaries (Li+, 2020)J/other/RAA/20.163 : Contact binaries in LAMOST DR7 (Qian+, 2020)J/AJ/162/13 : Parameters estimation for 173 eclipsing binaries (Li+, 2021)J/AJ/164/202 : Extremely Low Mass Ratio Contact Binar. I. 10 syst. (Li+, 2022)J/A+A/674/A33 : Gaia synthetic phot. cat. of white dwarfs (Gaia Coll., 2023)J/A+A/675/A195 : ZTF DR11 classification in ZTF/4MOST sky (Sanchez-Saez+, 2023)J/A+A/672/A176 : Mass-ratio distribution: contact binary stars (Pesta+, 2023)J/AJ/168/272 : BSN. I. Transit times & LCs 10 contact binary syst (Poro+, 2024)J/ApJS/271/32 : ASAS-SN eclipsing contact binaries with Gaia DR3 (Li+, 2024)http://var2.astro.cz/ocgate/ : O-C Gateway (Czech Astronomical Society)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/214https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/214http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/214https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/214https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/214http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/214GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/170/214/targets (List of targets (added by CDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/214/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/214/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/214/targets?GETtext/xml+votable180.050000true253.869458629.71505780.0055555555555555566/9306 9476 13426 13499 14636 14802 32267 32312https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/170/214?format=asciiOpticalInfrareddefaultJ/AJ/170/214/targetsList of targets (added by CDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSystemSystem namemeta.id;meta.maincharprimaryBandsLight curve bands (1)meta.code;instr.filtercharFileLink to the light curve file in MRT format (Data behind Figure 3) (2)meta.id;meta.filecharNminNumber of times of minima observed for this target (link to Table 4)meta.numberintnullableLCInteractive light curve plotmeta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.mainJ/AJ/170/214/table4Times of minimarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSystemSystem namemeta.id;meta.maincharprimaryBJD[2453920/2460560] Barycentric Julian date of minimadtime.epochdoublee_BJD[8e-5/0.023] Uncertainty in BJDdstat.error;time.epochdoubleEpoch[-23167/0.5] Epoch Numbermeta.number;time.epochdoubleO-C[-0.057/0.018] Minima residual, daysdstat.fit.residualdoubleSourceSource (1)meta.bibchar