J/A+A/688/A152ivo://CDS.VizieR/J/A+A/688/A152doi:10.26093/cds/vizier.36880152CDSJadhav V.V.Subramaniam A.Sagar R.2024-11-21T20:02:30Z2024-08-14T07:11:06ZCDS support team

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

cds-question@unistra.fropen-star-clustersultraviolet-photometryvisible-astronomyEvolutionary pathways of binary systems are vastly different from single stellar evolution, and thus, there is a need to quantify their frequency and diversity. Open clusters are the best test-bed to unveil the secrets of binary populations due to their coeval nature. And the availability of multi-wavelength data in recent years has been critical in characterising the binary population. NGC 752 is a solar metallicity, intermediate-age open cluster located at 460 pc. In this work, we aim to identify the optically subluminous white dwarfs in NGC 752 and identify the illusive blue lurkers by association. We used multiwavelength photometry from Astrosat/UVIT, swift/UVOT, Gaia DR3 and other archival surveys to analyse the colour-magnitude diagrams and spectral energy distributions of 37 cluster members. We detected eight white dwarfs as companions to cluster members. Four of the systems are main sequence stars with extremely low mass white dwarfs as their companions. Two are these main sequence stars are also fast rotators. The presence of low mass white dwarfs and high rotation signals a past mass transfer, and we classified the four main sequence stars as blue lurkers. The binary fraction in NGC 752 was estimated to be 50-70%, and it shows that the contribution of optically undetected stars is crucial in quantifying the present-day binary fraction.2024A&A...688A.152Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/688/A152CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/177 : Proper motions in NGC 752 (Platais+, 1992)I/355 : Gaia DR3 (Gaia Collaboration, 2022)J/AJ/158/35 : Swift UVOT Stars Survey. III. Galactic open clustersJ/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/688/A152https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/688/A152http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/688/A152https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/688/A152https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/688/A152http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/688/A152GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/688/A152/table3 (Photometry and SED parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/688/A152/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/688/A152/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/688/A152/table3?GETtext/xml+votable180.050000true29.2324411137.799750.0055555555555555560/1.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/688/A152?format=asciiUVOpticaldefaultJ/A+A/688/A152/table3Photometry and SED parametersB_RB? 84th percentile of RBsolRadphys.size.radius;stat.maxfloatnullableB_RA? 84th percentile of RAsolRadpos.eq.rafloatnullableLA? Luminosity of A componentsolLumphys.luminosityfloatnullableb_LA? 16th percentile of LAsolLumphys.luminosity;stat.minfloatnullableB_LA? 84th percentile of LAsolLumphys.luminosity;stat.maxfloatnullableloggA? Surface gravity of A componentlog(cm.s**-2)phys.gravityfloatnullableMHA? Metallicity of A componentphys.abund.FefloatnullableTeB? Temperature of B componentKphys.temperaturefloatnullableb_TeB? 16th percentile of TeBKphys.temperature;stat.minfloatnullableB_TeB? 84th percentile of TeBKphys.temperature;stat.maxfloatnullableRB? Radius of B componentsolRadphys.size.radiusfloatnullableb_RB? 16th percentile of RBsolRadphys.size.radius;stat.minfloatnullableF148W? UVIT/F148W magnitude (AB)magphot.mag;em.UVfloatnullablee_F148W? Error in F148W magnitude)magstat.errorfloatnullableF169M? UVIT/F169M magnitude (AB)magphot.mag;em.UVfloatnullablee_F169M? Error in F169M magnitude)magstat.errorfloatnullableTeA? Temperature of A componentKphys.temperaturefloatnullableb_TeA? 16th percentile of TeAKphys.temperature;stat.minfloatnullableB_TeA? 84th percentile of TeAKphys.temperature;stat.maxfloatnullableRA? Radius of A componentsolRadphys.size.radiusnullableb_RA? 16th percentile of RAsolRadpos.eq.rafloatnullableLB? Luminosity of B componentsolLumphys.luminosityfloatnullableb_LB? 16th percentile of LBsolLumphys.luminosity;stat.minfloatnullableB_LB? 84th percentile of LBsolLumphys.luminosity;stat.maxfloatnullableloggB? Surface gravity of B componentlog(cm.s**-2)phys.gravityfloatnullablevgfb2? vgfb2 parameter of the SED fitstat.fit.paramfloatnullablechi2r? Reduced chi2 parameter of the SED fitstat.fit.chi2floatnullableexcessUV[0/1]? Presence of UV excess (1)meta.codeintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (star0-star49)meta.id;meta.maincharPlatais? ID from Platais et al., 1992BICDS..40....5Pmeta.idintnullableGaiaDR3Gaia EDR3 source_idmeta.idRA_ICRSRight ascension (ICRS) at Ep=2016degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016degpos.eq.dec;meta.mainGmagGaia DR3 mean G magnitudemagphot.mag;em.optdoubleBP-RPGaia DR3 BP-RP colourmagphot.color;em.opt.B;em.opt.Rdouble