J/other/OEJV/258ivo://CDS.VizieR/J/other/OEJV/258CDSDzygunenko A.Tvardovskyi D.2025-09-22T06:52:22Z2025-05-30T14:26:30ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvariable-starsephemeridesphotometryWe studied three eclipsing binary systems: TIC 199716496, TIC 414764074, and TIC 435447013, using TESS space telescope photometric data. We classified the first and the third stars as Algol-type variables and the second star as W Ursae Majoris. We calculated the periods and initial epochs for all three objects and later corrected them using O-C curve analysis. Further investigation revealed a significant reflection effect in TIC 435447013, and possible star spots in TIC 414764074. Moreover, TIC 199716496 appeared to have strange semiregular period changes. These findings enhance our understanding of binary systems despite raising even more questions about the nature of observed features of variable stars.2025OEJV..258....1Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/OEJV/258CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/OEJV/258https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/OEJV/258http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/OEJV/258https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/OEJV/258https://vizier.iucaa.in/viz-bin/votable?-source=J/other/OEJV/258http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/OEJV/258GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/other/OEJV/258/extremaJD moments of minima and maxima for the three eclipsing binaries (TIC 199716496, TIC 414764074 and TIC 435447013)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTICTarget ID for each eclipsing binary starmeta.id;meta.mainlongExtrema[min max P S] Extremum type ('Min' for minimum, 'Max' for maximum, 'P' for primary, 'S' for secondary)meta.codecharJDJulian Date of the extremumdtime.epochdoublee_JDError in the Julian Date of the extremumdstat.error;time.epochdouble