J/A+A/659/A8ivo://CDS.VizieR/J/A+A/659/A8doi:10.26093/cds/vizier.36590008CDSZasche P.Henzl Z.Kara J.2022-09-07T12:51:05Z2022-03-16T08:08:32ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryvisible-astronomyWe present the discovery and the very first analysis of four stellar systems showing two periods of eclipses, that are the objects classified as doubly eclipsing systems. Some of them were proved to orbit each other thanks to their eclipse-timing-variations (ETVs) of both pairs, hence they really constitute rare quadruples with two eclipsing pairs. Some of them do not, as we are still waiting for more data to detect their mutual movement. Their light curves and period changes were analysed. All of them are detached and near-contact, but none of them contact; moreover, to our knowledge none of these stars can be considered as blend of two spatially unresolved close components on the sky. These systems are CzeV2647 (0.5723296+0.9637074 days), proved to orbit with 4.5-year periodicity; CzeV1645 (1.0944877+1.6594641 days), with a rather questionable detection of ETV; CzeV3436 (0.6836870+0.3833930 days); and, finally, OGLE SMC-ECL-1758 (0.9291925+3.7350826 days), proved to move on its 30-year orbit. Even more surprising is the fact that most of these systems show the ratio of their two orbital periods close to coupling near some resonant values of small integers, namely CzeV2647, with only 1% from 3:5 resonance, CzeV1645 1% from 2:3 resonance, and OGLE SMC-ECL-1758 with only 0.49% from 1:4 resonance. The nature of these near-resonant states still remains a mystery.2022A&A...659A...8Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/659/A8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/659/A8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/659/A8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/659/A8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/659/A8https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/659/A8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/659/A8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/659/A8/table1 (Information about systems under analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/659/A8/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/659/A8/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/659/A8/table1?GETtext/xml+votable180.050000true303.52333338.3829170.0055555555555555566/14320 14566 14643 33295https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/659/A8?format=asciiOpticaldefaultJ/A+A/659/A8/table1Information about systems under analysisETVDisplay the heliocentric minimameta.ref.urlcharStarName of the starmeta.id;meta.maincharONameOther namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the light curvesmeta.ref.urlcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainmagmaxOut-of-eclipse magnitude, in Filtermagphot.magfloatFilter[VI] Filter (1)meta.id;instr.filtercharTeffEffective temperatureKphys.temperature.effectiveintr_TeffEffective temperature referencemeta.ref;pos.framecharJ/A+A/659/A8/etvDerived heliocentric minima of the systems used for our analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharPairPair A/Bmeta.code.multipcharHJDHeliocentric JD of Minimum (HJD-2400000)dtime.epoch;stat.mindoublee_HJDError of HJDdstat.error;time.epochdoubleFilterFilter usedinstr.bandpasscharRefSource/Observatorymeta.bibcharJ/A+A/659/A8/photomNew ground-based photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharHJDHeliocentric Julian Date (HJD-2400000)dtime.epochdoubleindexeddmagDifferential magnitude in Filtermagphot.mag;arith.difffloate_dmagError of magnitudemagstat.error;phot.magfloatFilter[RS] Photometric filter usedinstr.bandpasschar