J/MNRAS/492/3602ivo://CDS.VizieR/J/MNRAS/492/3602doi:10.26093/cds/vizier.74923602CDSJoshi Y.C.Maurya J.John A.A.Panchal A.Joshi S.Kumar B.2024-08-20T20:15:43Z2023-06-12T15:33:48ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starsvisible-astronomytrigonometric-parallaxproper-motionseffective-temperaturestellar-massesinfrared-photometrybroad-band-photometryWe present a comprehensive photometric analysis of a young open cluster NGC 1960 (=M36) along with the long-term variability study of this cluster. Based on the kinematic data of Gaia DR2, the membership probabilities of 3871 stars are ascertained in the cluster field among which 262 stars are found to be cluster members. Considering the kinematic and trigonometric measurements of the cluster members, we estimate a mean cluster parallax of 0.86+/-0.05mas and mean proper motions of {mu}RA=-0.143+/-0.008mas/yr and {mu}Dec.=-3.395+/-0.008mas/yr. We obtain basic parameters of the cluster such as E(B-V)=0.24+/-0.02 mag, log(Age/yr)=7.44+/-0.02, and d=1.17+/-0.06kpc. The mass function slope in the cluster for the stars in the mass range of 0.72-7.32M_{sun}_ is found to be {gamma}=-1.26+/-0.19. We find that mass segregation is still taking place in the cluster which is yet to be dynamically relaxed. This work also presents first high-precision variability survey in the central 13arcminx13arcmin region of the cluster. The V-band photometric data accumulated on 43 nights over a period of more than 3yr reveals 76 variable stars among which 72 are periodic variables. Among them, 59 are short period (P<1d) and 13 are long period (P>1d). The variable stars have V magnitudes ranging between 9.1 to 19.4mag and periods between 41min and 10.74d. On the basis of their locations in the H-R diagram, periods, and characteristic light curves, 20 periodic variables belong to the cluster are classified as 2 {delta}-Scuti, 3 {gamma}-Dor, 2 slowly pulsating B stars, 5 rotational variables, 2 non-pulsating B stars, and 6 as miscellaneous variables.2020MNRAS.492.3602Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/492/3602CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/AJ/132/1669 : Wide-field CCD phot. around nine open clusters (Sharma+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/492/3602https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/492/3602http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/492/3602https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/492/3602https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/492/3602http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/492/3602GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/492/3602/table4 (Photometric catalogue of 3962 stars detected in the field of cluster NGC 1960)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3602/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3602/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3602/table4?GETtext/xml+votable180.050000true84.096041734.17577780.005555555555555556Cone search capability for table J/MNRAS/492/3602/table5 (The photometric parameters given for 262 cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3602/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3602/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3602/table5?GETtext/xml+votable180.050000true84.163534.06391670.005555555555555556Cone search capability for table J/MNRAS/492/3602/table10 (The details of the 72 periodic variables found in the cluster NGC 1960)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3602/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3602/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3602/table10?GETtext/xml+votable180.050000true83.960791734.20158330.005555555555555556Cone search capability for table J/MNRAS/492/3602/table11 (The parameters of four irregular variable stars identified in the cluster NGC 1960)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3602/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3602/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3602/table11?GETtext/xml+votable180.050000true84.039166734.12369440.0055555555555555566/24508 245101.1166583743361574e-19 6.194049834323928e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/492/3602?format=asciiOpticalInfrareddefaultJ/MNRAS/492/3602/table4Photometric catalogue of 3962 stars detected in the field of cluster NGC 1960recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/3962] Star identification numbermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainUmag? Johnson-Cousins U-band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? Error on Umagmagstat.error;phot.magfloatnullableBmag? Johnson-Cousins B-band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error on Bmagmagstat.error;phot.magfloatnullableVmag? Johnson-Cousins V-band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Error on Vmagmagstat.error;phot.magfloatnullableRmag? Johnson-Cousins R-band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Error on Rmagmagstat.error;phot.magfloatnullableImag? Johnson-Cousins I-band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error on Imagmagstat.error;phot.magfloatnullableJmag? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error on Jmagmagstat.error;phot.magfloatnullableHmag? 2MASS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Error on Hmagmagstat.error;phot.magfloatnullableKmag? 2MASS K-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Error on Kmagmagstat.error;phot.magfloatnullableplx? Gaia DR2 parallaxmaspos.parallax.trigfloatnullablee_plx? Error on plxmasstat.error;pos.parallaxfloatnullablepmRA? Gaia DR2 proper motion in right ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Error on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Error on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullableProb? Membership probabilitystat.probabilityfloatnullableMoreLink to tables 5, 10 and 11meta.ref.urlcharJ/MNRAS/492/3602/table5The photometric parameters given for 262 cluster memberse_E(B-V)? Error on E(B-V)magstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[3/3902] Star identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagJohnson-Cousins V-band magnitudemagphot.mag;em.opt.Vfloate_Vmag? Error on Vmagmagstat.error;phot.magfloatnullableE(B-V)? The (B-V) color excessmagphot.color.excessfloatnullableplxGaia DR2 parallaxmaspos.parallax.trigfloate_plxError on plxmasstat.error;pos.parallaxfloatpmRAGaia DR2 proper motion in right ascensionmas/yrpos.pm;pos.eq.rafloate_pmRAError on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEGaia DR2 proper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmDEError on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatProbMembership probabilitystat.probabilityfloatJ/MNRAS/492/3602/table10The details of the 72 periodic variables found in the cluster NGC 1960recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVIDVariable sequence ID VNNmeta.idcharprimaryID[7/2549] Star identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV-band mean magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullablePeriodPerioddtime.perioddoublee_PeriodError on Perioddstat.error;time.perioddoubleAmpVAmplitude of variation in V bandmagsrc.var.amplitudefloatNNumber of data pointsmeta.numberintT0Epoch of minimum light (JD-2450000)dtime.epochdoubleMemb[Cluster/Field] Membership status of the variable starmeta.code.membercharMoreLink to Table 12meta.ref.urlcharJ/MNRAS/492/3602/table11The parameters of four irregular variable stars identified in the cluster NGC 1960recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIrIDIrregular variable identifier (IrN)meta.idcharID[384/2268] Star identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV-band mean magnitudemagphot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatDVTotal magnitude variation between the minimum and maximum brightnessmagsrc.var.amplitudefloatNNumber of data pointsmeta.numberintMemb[Cluster/Field] Membership status of the variable starmeta.code.membercharJ/MNRAS/492/3602/table12The basic parameters estimated for the 20 periodic variables found in the cluster NGC 1960recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogTeffLogarithm of Tefflog(K)phys.temperature.effectivefloatBCVBolometric correctionmagphot.mag.bcfloatMbolBolometric magnitudemagphys.magAbs.bolfloatlogLLogarithm of the star luminositylog(solLum)phys.luminosity;em.optfloatMassStar masssolMassphys.massfloatTypeVariable type (1)meta.code;src.varcharVIDVariable sequence ID VNNmeta.id;meta.mainchar