J/MNRAS/399/432ivo://CDS.VizieR/J/MNRAS/399/432doi:10.26093/cds/vizier.73990432CDSNaylor T.2024-07-09T20:16:03Z2010-04-09T11:45:51ZCDS support team

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

cds-question@unistra.frastronomical-modelsopen-star-clustersearly-type-starsvisible-astronomybroad-band-photometryWe fit the colour-magnitude diagrams of stars between the zero-age main-sequence and terminal-age main sequence in young clusters and associations. The ages we derive are a factor of 1.5-2 longer than the commonly used ages for these regions, which are derived from the positions of pre-main-sequence stars in colour-magnitude diagrams. From an examination of the uncertainties in the main-sequence and pre-main-sequence models, we conclude that the longer age scale is probably the correct one, which implies that we must revise upwards the commonly used ages for young clusters and associations. Such a revision would explain the discrepancy between the observational lifetimes of protoplanetary discs and theoretical calculations of the time to form planets. It would also explain the absence of clusters with ages between 5 and 30Myr.2009MNRAS.399..432Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/399/432CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/399/432https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/399/432http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/399/432https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/399/432https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/399/432http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/399/432GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/399/432/tables (Fitted data set for 10 clusters (tables 2-11 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/432/tables?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/432/tables?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/432/tables?GETtext/xml+votable180.050000true83.70515449.48957920.0055555555555555566/461 463 472 474 496 15682-15683 22851 22854 23637 23639 23717 24362 28890-28891 37229-37231 39181 39183 39194 39907https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/399/432?format=asciiOpticaldefaultJ/MNRAS/399/432/table1Estimated MS and PMS ages of 10 clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster or group namemeta.id;meta.maincharprimaryAgePMS? Pre-main sequence ageMyrtime.age;obs.sequencefloatnullableAgeMSMain sequence age best fitMyrtime.age;meta.modelled;meta.mainfloatl_AgeMSlLimit flag on AgeMS68meta.code.errorcharAgeMSlLower limit of 68% AgeMS confidence intervalMyrstat.error;time.agefloatAgeMSu? Upper limit of 68% AgeMS confidence interval confidence intervalMyrstat.error;stat.maxfloatnullablePr(tau2)Cumulative distribution of the expected value of {tau}^2^ (2)stat.fit.chi2floatm-MCluster distance modulusmagphot.mag.distModfloatE(B-V)B-V colour excessmagphot.color.excessfloatn_E(B-V)[ab] Origin of E(B-V) (1)meta.notecharRefNumbering reference systemmeta.ref.url;pos.framecharSimbadSimbad column added by the CDScharJ/MNRAS/399/432/tablesFitted data set for 10 clusters (tables 2-11 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster or group namemeta.id.parentcharSeqSequential numbermeta.recordintVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatnullableE(B-V)? B-V colour excessmagphot.color.excessfloatnullableSNameSimbad namemeta.idcharSimbadNameSimbad column added by the CDSmeta.idchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable