J/MNRAS/493/5565ivo://CDS.VizieR/J/MNRAS/493/5565doi:10.26093/cds/vizier.74935565CDSShah N.Singh K.P.Subramaniam A.2025-02-28T20:15:56Z2023-07-26T08:25:43ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsmilky-way-galaxyastrometrystellar-distanceradial-velocityeffective-temperaturestellar-radiistellar-massesultraviolet-astronomyvisible-astronomyx-ray-sourcesStar clusters are ideal platforms for categorizing X-ray emitting stars and to study X-ray emission as a function of stellar age and activity. We present a comprehensive study of an open star cluster, NGC 2527, by combining data from XMM-UVOT-Gaia. Cluster membership of stars and their photometry are taken from Gaia and cross-matched with XMM and UVOT detections. We estimate the age of NGC 2527 as ~630Myr, reddening as E(B-V)=0.13mag, and a distance of 642+/-30pc using PARSEC isochrones. We detect five sub-subgiants and five bandgap stars, which defy single star evolution. We estimate the temperature, mass, radius, and luminosity of 53 single stars and 10 potential binary stars using a python code that fits single and composite Kurucz spectra to broad-band spectral energy distribution. Among the 12 X-ray emitting members, we find that five are potential RS CVn-type binaries, two are potential FK Comae type of red giant branch (RGB) stars, and five are main sequence (MS) stars with high coronal activity. Members with strong UV emission comprise one RGB star and several MS stars with UV excess suggestive of chromospheric activity. Based on comparison with other clusters, we tentatively suggest that X-ray luminosity of both RS CVn and contact binaries increases with age, suggesting that more active binaries are present in older clusters as compared to younger clusters. This study suggests possible presence of W UMa and FK Comae-type stars in younger (age~630Myr) clusters.2020MNRAS.493.5565Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/5565CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/158/35 : Swift UVOT Stars Survey. III. Galactic open clustersJ/A+A/615/A49 : TGAS stars membership in 128 open clustershttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/5565https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/5565http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/5565https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/5565https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/5565http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/5565GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/5565/table3 (Properties of cluster members detected in the XMM observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/5565/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/5565/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/5565/table3?GETtext/xml+votable180.050000true121.3632083-28.29258060.005555555555555556Cone search capability for table J/MNRAS/493/5565/tabled (Properties of peculiar stars that deviate from standard evolutionary models in the optical CMD)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/5565/tabled?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/5565/tabled?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/5565/tabled?GETtext/xml+votable180.050000true120.84167-28.445280.0055555555555555566/39772-39773 39775 39796-39797 40480-3.4771685954054845e-18 4.139003408266671e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/5565?format=asciiX-rayUVOpticaldefaultJ/MNRAS/493/5565/table3Properties of cluster members detected in the XMM observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMoreLink to Tables 5,6,A,B and Cmeta.ref.urlcharSXOM[1/65] Internal identifiermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDistDistancepcpos.distancefloate_DistError on Distpcstat.errorfloatRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error on RVkm/sstat.errorfloatnullableGmagGaia DR2 G magnitudemagphot.mag;em.optfloatBP-RPGaia DR2 BP-RP colourmagphot.color;em.opt.B;em.opt.RfloatPmemMembership probability of the star obtained from Cantat-Gaudin et al. (2018A&A...615A..49C, Cat. J/A+A/615/A49)stat.probabilityfloatl_RateLimit flag on Ratemeta.code.errorcharRateCount rate0.001count.s**-1phot.count;em.X-rayfloate_Rate? Error on Rate0.001count.s**-1stat.errorfloatnullablel_FXLimit flag on FXmeta.code.errorcharFXX-ray flux1e-18W.m**-2phot.flux;em.X-rayfloatl_LXLimit flag on LXmeta.code.errorcharLXX-ray luminosity1e+22Wphys.luminosity;em.X-rayfloatTypeStar type depending upon its position in the optical CMD (1)meta.code.classcharJ/MNRAS/493/5565/table5Fundamental parameters of cluster members detected in X-ray and UV, estimated from single Kurucz spectrum SED fittinge_TeffError on TeffKstat.error;phys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintExcess[YN] Indicates whether an Excess feature is observed in the residual plots of the single spectrum SED fitmeta.codecharDip[YN] Indicates whether a Dip feature is observed in the residual plots of the single spectrum SED fitmeta.codecharSXOM[1/65] Internal identifiermeta.id;meta.mainintTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggError on logglog(cm.s**-2)stat.errorfloatRadStar radiussolRadphys.size.radiusfloate_RadError on RadsolRadstat.errorfloatLStar luminositysolLumphys.luminosityfloate_LError on LsolLumstat.errorfloatMassStar masssolMassphys.massfloatchi2Reduced chi-squared of the best-fitting Kurucz spectrumstat.fit.chi2floatJ/MNRAS/493/5565/table6Comparison of fundamental parameters of cluster members detected in X-ray and UV, estimated from single and composite Kurucz spectrum SED fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinte_L1Error on L1solLumstat.errorfloate_L2Error on L2solLumstat.errorfloatSXOM[8/61] Internal identifiermeta.id;meta.mainintTEffective temperature from the best-fitting single Kurucz spectrumKphys.temperature.effectiveinte_TError on TKstat.errorintchi2Reduced chi-squared of the best-fitting single Kurucz spectrumstat.fit.chi2floatT1Effective temperature of the first component in the Kurucz and Kurucz composite spectrum fitKphys.temperature.effectiveinte_T1Error on T1Kstat.errorintT2Effective temperature of the second component in the Kurucz and Kurucz composite spectrum fitKphys.temperature.effectiveinte_T2Error on T2Kstat.errorintchi2KKReduced chi-squared of the best-fitting composite spectrumstat.fit.chi2floatR1Radius of the first component in the Kurucz and Kurucz composite spectrum fitsolRadphys.size.radiusfloate_R1Error on R1solRadstat.errorfloatR2Radius of the second component in the Kurucz and Kurucz composite spectrum fitsolRadphys.size.radiusfloate_R2Error on R2solRadstat.errorfloatL1Luminosity of the first component in the Kurucz and Kurucz composite spectrum fitsolLumphys.luminosityfloatL2Luminosity of the second component in the Kurucz and Kurucz composite spectrum fitsolLumphys.luminosityfloatM1? Mass of the first component in the Kurucz and Kurucz composite spectrum fitsolMassphys.massfloatnullableM2? Mass of the second component in the Kurucz and Kurucz composite spectrum fitsolMassphys.massfloatnullableJ/MNRAS/493/5565/tableaMagnitudes and fluxes of cluster members that are detected in XMM OM and Swift UVOT observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSXOM[1/62] Internal identifiermeta.id;meta.mainintUVW2mag? Swift/UVOT UVW2-band magnitudemagphot.mag;em.UVfloatnullablee_UVW2mag? Error on UVW2magmagstat.error;phot.magfloatnullableUVM2mag? Swift/UVOT UVM2-band magnitudemagphot.mag;em.UVfloatnullablee_UVM2mag? Error on UVM2magmagstat.error;phot.magfloatnullableUVW1mag? Swift/UVOT UVW1-band magnitudemagphot.mag;em.UVfloatnullablee_UVW1mag? Error on UVW1magmagstat.error;phot.magfloatnullableFUVW2S? Swift/UVOT UVW2 flux1e-16W.m**-2.nm**-1phot.flux;em.UVfloatnullablee_FUVW2S? Error on FUVW2S1e-16W.m**-2.nm**-1stat.errorfloatnullableFUVM2S? Swift/UVOT UVM2 flux1e-16W.m**-2.nm**-1phot.flux;em.UVfloatnullablee_FUVM2S? Error on FUVM2S1e-16W.m**-2.nm**-1stat.errorfloatnullableFUVW1S? Swift/UVOT UVW1 flux1e-16W.m**-2.nm**-1phot.flux;em.UVfloatnullablee_FUVW1S? Error on FUVW1S1e-16W.m**-2.nm**-1stat.errorfloatnullableFUVW2X? XMM/OM UVW2 flux1e-16W.m**-2.nm**-1phot.flux;em.UVfloatnullablee_FUVW2X? Error on FUVW2X1e-16W.m**-2.nm**-1stat.errorfloatnullableFUVM2X? XMM/OM UVM2 flux1e-16W.m**-2.nm**-1phot.flux;em.UVfloatnullablee_FUVM2X? Error on FUVM2X1e-16W.m**-2.nm**-1stat.errorfloatnullableQFUVW2? Quality flag in the OM UVW2 filtermeta.code.qual;instr.filterintnullableQFUVM2? Quality flag in the OM UVM2 filtermeta.code.qual;instr.filterintnullableJ/MNRAS/493/5565/tablebExtinction corrected fluxes obtained from VO photometryFg? Flux on the Pan-STARRS g-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Bfloatnullablee_Fg? Error on Fg1e-16W.m**-2.nm**-1stat.errorfloatnullableFr? Flux on the Pan-STARRS r-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Rfloatnullablee_Fr? Error on Fr1e-16W.m**-2.nm**-1stat.errorfloatnullableFz? Flux on the Pan-STARRS z-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Ifloatnullablee_Fz? Error on Fz1e-16W.m**-2.nm**-1stat.errorfloatnullableFy? Flux on the Pan-STARRS y-band1e-16W.m**-2.nm**-1phot.flux.density;em.IRfloatnullablee_Fy? Error on Fy1e-16W.m**-2.nm**-1stat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSXOM[1/62] Internal identifiermeta.id;meta.mainintFB? Flux on the APASS B-band1e-16W.m**-2.nm**-1phot.flux.density;em.opt.Bfloatnullablee_FB? Error on FB1e-16W.m**-2.nm**-1stat.errorfloatnullableFV? Flux on the APASS V-band1e-16W.m**-2.nm**-1phot.flux.density;em.opt.Vfloatnullablee_FV? Error on FV1e-16W.m**-2.nm**-1stat.errorfloatnullableFi? Flux on the Pan-STARRS i-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Ifloatnullablee_Fi? Error on Fi1e-16W.m**-2.nm**-1stat.errorfloatnullableFBPFlux on the Gaia BP-band1e-16W.m**-2.nm**-1phot.flux.density;em.opt.Bfloate_FBPError on FBP1e-16W.m**-2.nm**-1stat.errorfloatFGFlux on the Gaia G-band1e-16W.m**-2.nm**-1phot.flux.density;em.optfloate_FGError on Fg1e-16W.m**-2.nm**-1stat.errorfloatFRPFlux on the Gaia RP-band1e-16W.m**-2.nm**-1phot.flux.density;em.opt.Rfloate_FRPError on FRP1e-16W.m**-2.nm**-1stat.errorfloatJ/MNRAS/493/5565/tablecParanal, 2MASS, and WISE fluxesSXOM[1/62] Internal identifiermeta.id;meta.maininte_Fg? Error on Fg1e-16W.m**-2.nm**-1stat.errorfloatnullableFHFlux on the 2MASS H-band1e-17W.m**-2.nm**-1phot.flux.density;em.IR.HfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFu? Flux on the Paranal/OmegaCAM u-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Ufloatnullablee_Fu? Error on Fu1e-16W.m**-2.nm**-1stat.errorfloatnullableFHalpha? Flux on the Paranal/OmegaCAM H{alpha}-band1e-16W.m**-2.nm**-1phot.flux;em.line.Halphafloatnullablee_FHalpha? Error on FHalpha1e-16W.m**-2.nm**-1stat.errorfloatnullableFg? Flux on the Paranal/OmegaCAM g-band1e-16W.m**-2.nm**-1phot.mag;em.opt.BfloatnullableFr? Flux on the Paranal/OmegaCAM r-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Rfloatnullablee_Fr? Error on Fr1e-16W.m**-2.nm**-1stat.errorfloatnullableFi? Flux on the Paranal/OmegaCAM i-band1e-16W.m**-2.nm**-1phot.mag;em.opt.Ifloatnullablee_Fi? Error on Fi1e-16W.m**-2.nm**-1stat.errorfloatnullableFJFlux on the 2MASS J-band1e-17W.m**-2.nm**-1phot.flux.density;em.IR.Jfloate_FJError on FJ1e-17W.m**-2.nm**-1stat.errorfloate_FHError on FH1e-17W.m**-2.nm**-1stat.errorfloatFKsFlux on the 2MASS Ks-band1e-17W.m**-2.nm**-1phot.mag;em.IR.Kfloate_FKsError on FKs1e-17W.m**-2.nm**-1stat.errorfloatFW1Flux on the WISE W1-band1e-19W.m**-2.nm**-1phot.mag;em.IR.3-4umfloate_FW1Error on FW11e-19W.m**-2.nm**-1stat.errorfloatFW2Flux on the WISE W2-band1e-19W.m**-2.nm**-1phot.mag;em.IR.4-8umfloate_FW2Error on FW21e-19W.m**-2.nm**-1stat.errorfloatJ/MNRAS/493/5565/tabledProperties of peculiar stars that deviate from standard evolutionary models in the optical CMD_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.raindexedBP-RPGaia DR2 BP-RP colourmagphot.color;em.opt.B;em.opt.RfloatRV? Radial velocity from Gaia DR2km/sphys.veloc;pos.heliocentricintnullablee_RV? Error on RVkm/sstat.errorintnullablePmemMembership probability of the starstat.probabilityfloat_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRSRight ascension (ICRS) at Ep=2015.5pos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2015.5pos.eq.dec;meta.mainDistDistance from Gaia DR2pcpos.distancefloate_DistError on Distpcstat.errorfloatGmagGaia DR2 G-band magnitudemagphot.mag;em.optfloatTypeStar type depending upon its position in the optical CMD (1)meta.code.classchar