J/MNRAS/522/847ivo://CDS.VizieR/J/MNRAS/522/847CDSKumar R.Pradhan A.C.Sahu S.Subramaniam A.Piridi S.Cassisi S.,Ojha D.K.2026-07-27T12:53:30Z2026-07-27T13:53:18ZCDS support team

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

cds-question@unistra.frglobular-star-clustershorizontal-branch-starsultraviolet-astronomyphotometryastrometryeffective-temperatureabsolute-magnitudestellar-radiistellar-distanceWe present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the GC UVIT Legacy Survey programme (GlobULeS). We use observations made with F148W and F169M filters of the Ultraviolet Imaging Telescope (UVIT) onboard AstroSat along with ground-based data (UBVRI filters), Hubble Space Telescope(HST) GC catalogue, and Gaia EDR3 catalogue. Based on the FUV-optical colour-magnitude diagrams, we classify the sources into the horizontal branch (HB) stars, post-HB stars, and hot white dwarfs (WDs) in both the GCs. The comparison of synthetic and observed colours of the observed HB stars suggests that the mass-loss at the red giant branch and He spread in both clusters have a simultaneous effect on the different HB distributions detected in M3 and M13, such that HB stars of M13 require a larger spread in He (0.247-0.310) than those of M3 (Y = 0.252-0.266). The evolutionary status of HB stars, post-HB stars, and WDs are studied using SED fit parameters and theoretical evolutionary tracks on the H-R diagram. We found that the observed post-HB stars have evolved from zero-age HB (ZAHB) stars of the mass range of 0.48-0.55 M_{sun}_ in M3 and M13. We detect 24 WD candidates in each cluster having log(Lbol/L_{sun}_) in the range of -0.8 to +0.6 and log(Teff/K) in the range of 4.2-5.0. Placing the WDs on the H-R diagram and comparing them with models, it is found that M13 has a population of low-mass WDs, probably originating from binary evolution.2023MNRAS.522..847Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/522/847CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/505/5978 : Gaia EDR3 view on Galactic globular clustersJ/MNRAS/485/3042 : UBVRI photometry in 48 globular clusters (Stetson+, 2019)J/MNRAS/482/1080 : UVIT-HST-GAIA view of NGC 288 hot stars (Sahu+, 2019)J/MNRAS/437/1609 : NGC 2808 HB stars abundances (Marino+, 2014)J/A+A/627/A34 : GC hot UV-bright stars model spectra (Moehler+, 2019)J/A+A/557/A19 : Mass and age of extreme low-mass white dwarfsJ/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)J/A+A/465/249 : Age and colors of massive white dwarf stars (Althaus+, 2007)J/A+A/320/757 : M3 stars CCD photometry (Ferraro+ 1997)J/ApJ/926/99 : Above-horizontal-branch (AHB) stars in Gal. GCsJ/ApJS/231/1 : Hot DA white dwarfs grid of synthetic spectraJ/AJ/161/204 : Astrometry and photometry for 156 ZNG UV-bright starsJ/AJ/143/121 : UV properties of Galactic globulars with GALEX.VII/195 : Globular Clusters in the Milky Way (Harris, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/522/847https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/522/847http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/522/847https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/522/847https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/522/847http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/522/847GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/522/847/table2 (Stellar parameters along with their associated errors of 217 HBs of M3 and 678 HBs of M13 derived from SED fitting)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/522/847/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/522/847/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/522/847/table2?GETtext/xml+votable180.050000true205.6062928.389820.0055555555555555566/9436 10336-10337https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/522/847?format=asciiUVdefaultJ/MNRAS/522/847/table2Stellar parameters along with their associated errors of 217 HBs of M3 and 678 HBs of M13 derived from SED fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name parent either M3 217 times or M13 663 times (Cluster)meta.id.parentcharPhasePhase on CMS diagrams as fig. 2 of sect. 3 UV-optical CMDs with UVIT observed stars in bHB, iHB, and eHB regions respectively 500, 203, 177 times in our sample (Phase)src.classcharIDIdentifier number from UVIT observations (ID)meta.id;meta.mainintRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainTeffEffective temperature from SED fitting (Teff)Kphys.temperature.effectiveintE_TeffUpper uncertainty of Teff (eTeffp)Kstat.error;stat.maxinte_TeffLower uncertainty of Teff (eTeffm)Kstat.error;phys.temperature.effectiveintloggLogaritm of the surface gravity from SED fitting (logg)log(cm.s**-2)phys.gravityfloate_loggUncertainty of logg (elogg)log(cm.s**-2)stat.errorfloatLStellar luminosity from SED fitting (L)solLumphys.luminosityfloate_LUncertainty of L (eL)solLumstat.errorfloatRStellar radius from SED fitting (R)solRadphys.size.radiusfloate_RUncertainty of R (eR)solRadstat.errorfloatModelStellar atmosphere model used (Model) (1)instr.setup;meta.modelledcharDRadial angular distance from the cluster centre from SED fitting (Radial_distance)arcsecpos.angDistancefloatGaiaDisplay the Gaia EDR3 catalog of Gaia Collaboration 2021A&A...649A...1G, Cat. I/350meta.ref.urlchar