J/AJ/169/145ivo://CDS.VizieR/J/AJ/169/145doi:10.26093/cds/vizier.51690145CDSChulkov D.Strakhov I.Safonov B.2025-05-21T20:12:48Z2025-02-28T10:17:35ZCDS support team

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

cds-question@unistra.frinterferometrymultiple-starsopen-star-clustersThe Pleiades is the most prominent open star cluster visible from Earth and an important benchmark for simple stellar populations unified by common origin, age, and distance. Binary stars are its essential ingredient, yet their contribution remains uncertain due to heavy observational biases. A resolved multiplicity survey was conducted for a magnitude-limited G<15mag sample of 423 potential cluster members, including sources with poorly fitted astrometric solutions in Gaia DR3. Speckle interferometric observations at the 2.5 meter telescope of the Sternberg Astronomical Institute, Moscow State University observatory were combined with Gaia data, enabling the identification of 61 resolved binary or multiple systems within the 0.04-10arcsec (5-1350au) separation range. With speckle observations, we discovered 21 components in 20 systems. The existence of a Merope (23 Tau) companion is confirmed after several previous unsuccessful attempts. We show that the Gaia multipeak fraction is a strong predictor of subarcsecond multiplicity, as all sources with ipd_frac_multi_peak > 4% are successfully resolved. We found that 10% of Pleiades stars have a companion with a mass ratio q>0.5 within the projected separation of 27<s<1350 u, and confirm a deficit of wide binaries with s>300au. An observed dearth of wide pairs with a large mass ratio (q>0.55) may imprint the transition from hard to soft binaries regime at the early stages of cluster evolution. The total binary fraction for q>0.5 systems is extrapolated to be around 25%.2025AJ....169..145Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/145CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/AJ/168/156 : Observational sample of Pleaides stars (Chulkov, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/145https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/169/145/table2 (List of resolved Gaia DR3 systems in Pleiades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/145/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/145/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/145/table2?GETtext/xml+votable180.050000true56.476985324.554510.005555555555555556Cone search capability for table J/AJ/169/145/table3 (List of speckle-resolved systems in Pleiades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/145/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/145/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/145/table3?GETtext/xml+votable180.050000true56.581607823.94835890.005555555555555556Cone search capability for table J/AJ/169/145/table5 (Observations of speckle-resolved Pleiades Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/145/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/145/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/145/table5?GETtext/xml+votable180.050000true56.581607823.94835890.005555555555555556Cone search capability for table J/AJ/169/145/table6 (Detection limits for Pleiades stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/145/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/145/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/145/table6?GETtext/xml+votable180.050000true56.8712524.10494440.0055555555555555565/115 118 121 6/454-455 457 459 466-467 496-4981.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/169/145?format=asciidefaultJ/AJ/169/145/table2List of resolved Gaia DR3 systems in PleiadesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS Identification (J2000)meta.id;meta.maincharGaiaDR3Display the Gaia DR3 data of the primary and secondarymeta.ref.urlcharGaia1Gaia DR3 designation of primary sourcemeta.idGmag1Gaia DR3 G magnitude of primary sourcemagphot.mag;em.optfloatm1Isochrone-estimated mass of primary starsolMassphys.massfloate_m1Primary mass uncertaintysolMassstat.errorfloatGaia2Gaia DR3 designation of secondary sourcemeta.idGmag2Gaia DR3 G magnitude of secondary sourcemagphot.mag;em.optfloatm2Isochrone-estimated mass of secondary starsolMassphys.massfloate_m2Secondary mass uncertaintysolMassstat.errorfloatSepAngular separationarcsecpos.angDistancefloatrel-PM? Relative proper motion of componentsmas/yrpos.pmfloatnullablePlxdev? Parallax deviation (see Equation 2)stat.stdevfloatnullableProbChance alignment probabilitystat.probabilityfloatqEstimated mass ratiophys.massfloate_qMass ratio uncertaintystat.errorfloatNotes[CFPRSW,] Notes (1)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/169/145/table3List of speckle-resolved systems in PleiadesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS Identification (J2000)meta.id;meta.maincharGaiaGaia DR3 designation of primary sourcemeta.idGmagGaia DR3 G magnitude of primary sourcemagphot.mag;em.optfloatDateObservation dateyrtime.epoch;obsdoubleSepAngular separationarcsecpos.angDistancefloatBand[Iyz] Passband of the filter (1)instr.bandpasscharDelmMagnitude contrastmagphot.mag;arith.difffloatm1Isochrone-estimated mass of primary starsolMassphys.massfloate_m1Primary mass uncertaintysolMassstat.errorfloatm2Isochrone-estimated mass of primary starsolMassphys.massfloate_m2Secondary mass uncertaintysolMassstat.errorfloatb_qLower bound of mass ratio m1/m2phys.mass;stat.minfloatqMass ratio m1/m2phys.massfloatB_qUpper bound of mass ratio m1/m2phys.mass;stat.maxfloatNotes[BDFGNSTW,] Notes (2)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/169/145/table5Observations of speckle-resolved Pleiades StarsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 designationmeta.idWDSWashington Double Star Catalog designationmeta.id;meta.maincharGmagGaia DR3 G magnitudemagphot.mag;em.optfloatDateObservation dateyrtime.epoch;obsdoubleBand[IRyz] Passband of the filter (1)instr.bandpasscharSeeingSeeing during observationsarcsecinstr.obsty.seeingfloatPairPair number within multiple systemmeta.idintSepAngular separationarcsecpos.angDistancefloate_SepAngular separation uncertaintyarcsecstat.errorfloatPAPosition angledegpos.posAngfloate_PAPosition angle uncertaintydegstat.errorfloatDelmMagnitude contrastmagphot.mag;arith.difffloate_DelmMagnitude contrast intrinsic uncertaintymagstat.errorfloatNotes[PRUWq,] Notes (2)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/169/145/table6Detection limits for Pleiades starsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 designationmeta.id;meta.mainGmag? Gaia DR3 G magnitudemagphot.mag;em.optfloatnullableDateObservation dateyrtime.epoch;obsdoubleBand[IRyz] Passband of the filter (1)instr.bandpasscharSeeingSeeing during observationsarcsecinstr.obsty.seeingfloatDelm01Detection limit at 0.1 arcsecmagphot.mag;arith.difffloatDelm02Detection limit at 0.2 arcsecmagphot.mag;arith.difffloatDelm04Detection limit at 0.4 arcsecmagphot.mag;arith.difffloatDelm06Detection limit at 0.6 arcsecmagphot.mag;arith.difffloatDelm10Detection limit at 1.0 arcsecmagphot.mag;arith.difffloatNotes[bd,] Notes (2)meta.notechar_RAPosiitons from Simbad and Gaia DR3 (right ascension part)degpos.eq.ra;meta.main_DEPosiitons from Simbad and Gaia DR3 (declination part)degpos.eq.dec;meta.main