J/MNRAS/375/1220ivo://CDS.VizieR/J/MNRAS/375/1220doi:10.26093/cds/vizier.73751220CDSMayne N.J.Naylor T.Littlefair S.P.Saunders E.S.Jeffries R.D.2024-07-04T20:17:50Z2007-06-23T15:16:48ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsinfrared-photometryvisible-astronomybroad-band-photometryopen-star-clustersWe have selected pre-main-sequence (PMS) stars in 12 groups of notional ages ranging from 1 to 35Myr, using heterogeneous membership criteria. Using these members we have constructed empirical isochrones in V, V-I colour-magnitude diagrams. This allows us to identify clearly the gap between the radiative main sequence and the convective PMS (the RC gap). We follow the evolution of this gap with age and show that it can be a useful age indicator for groups less than =15 Myr old. We also observe a reduction in absolute spreads about the sequences with age. Finally, the empirical isochrones allow us to place the groups in order of age, independently of theory. The youngest groups can be collated into three sets of similar ages. The youngest set is the ONC, NGC 6530 and IC 5146 (nominally 1Myr); next Cep OB3b, NGC 2362, Ori and NGC 2264 (nominally 3Myr); and finally Ori and IC 348 (nominally 45Myr). This suggests Cep OB3b is younger than previously thought, and IC 348 older. For IC 348 the stellar rotation rate distribution and fraction of stars with discs imply a younger age than we derive. We suggest this is because of the absence of O-stars in this cluster, whose winds and/or ionizing radiation may be an important factor in the removal of discs in other clusters.2007MNRAS.375.1220Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/375/1220CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/375/1220https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/375/1220http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/375/1220https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/375/1220https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/375/1220http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/375/1220GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/375/1220/ngc2547 (NGC 2547 photometric catalog (tables 4-5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/ngc2547?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/ngc2547?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/ngc2547?GETtext/xml+votable180.050000true122.14083333-49.120777780.005555555555555556Cone search capability for table J/MNRAS/375/1220/ngc7160 (NGC 7160 photometric catalog (tables 6-7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/ngc7160?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/ngc7160?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/ngc7160?GETtext/xml+votable180.050000true328.7949583362.322627780.005555555555555556Cone search capability for table J/MNRAS/375/1220/ngc2264 (NGC 2264 photometric catalog (tables 8-12))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/ngc2264?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/ngc2264?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/ngc2264?GETtext/xml+votable180.050000true100.126316679.225780560.005555555555555556Cone search capability for table J/MNRAS/375/1220/cepob3b (Cepheus OB3b photometric catalog (tables 13-18))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/cepob3b?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/cepob3b?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/cepob3b?GETtext/xml+votable180.050000true344.31262.431733330.005555555555555556Cone search capability for table J/MNRAS/375/1220/sigori (sigma Ori photometric catalog (tables 19-21))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/sigori?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/sigori?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/sigori?GETtext/xml+votable180.050000true85.24352917-2.483194440.005555555555555556Cone search capability for table J/MNRAS/375/1220/ic348 (IC 348 photometric catalog (tables 22-27))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/ic348?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/ic348?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/ic348?GETtext/xml+votable180.050000true56.2500916731.849363890.005555555555555556Cone search capability for table J/MNRAS/375/1220/persei (h and chi Per photometric catalog (tables 28-29))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/1220/persei?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/1220/persei?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/1220/persei?GETtext/xml+votable180.050000true36.041687556.956797220.0055555555555555565/814 5909 6/1538-1539 15662-15663 15682-15683 15689 15748-15749 22849 22851-22852 22854 22857 22860 23808 39181 39183 391923.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/375/1220?format=asciiOpticalInfrareddefaultJ/MNRAS/375/1220/ngc2547NGC 2547 photometric catalog (tables 4-5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/ngc7160NGC 7160 photometric catalog (tables 6-7)Cat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.VfloatnullableB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/ngc2264NGC 2264 photometric catalog (tables 8-12)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/cepob3bCepheus OB3b photometric catalog (tables 13-18)V-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualchare_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/sigorisigma Ori photometric catalog (tables 19-21)Cat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.BfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/ic348IC 348 photometric catalog (tables 22-27)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.Vfloatnullableq_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/perseih and chi Per photometric catalog (tables 28-29)q_V-IcQuality flag on V-Ic (2)meta.code.qual;phot.color;em.opt.VcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCat[0/1]? 0 for Full photometric catalog 1 for All stars in FOV catalogmeta.codeintnullableSampleSample member code(s), in samples.datmeta.idcharFieldField number.CCD number if available NNN.NN (1)meta.id;obs.fieldfloatMNLSJStar designation number from MNLSJ (2007)meta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainindexedXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmag? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableq_VmagQuality flag on Vmag (2)meta.code.qualcharV-Ic? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? rms uncertainty on V-Icmagstat.error;phot.color;em.opt.VfloatnullableB-V? Johnson B-V colour index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-V (3)magstat.error;phot.color;em.opt.Bfloatnullableq_B-VQuality flag on B-Vmag (2) (3)meta.code.qual;phot.color;em.opt.BcharJ/MNRAS/375/1220/samplesSamples of membership criteriarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCodeSample numbermeta.idintprimaryTypeType of datameta.notecharRefReferencesmeta.refchar