J/A+A/683/A165ivo://CDS.VizieR/J/A+A/683/A165doi:10.26093/cds/vizier.36830165CDSPelkonen V.-M.Miret-Roig N.Padoan P.2024-11-29T20:01:09Z2024-03-15T08:44:03ZCDS support team

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

cds-question@unistra.frstellar-associationsstellar-agesThe ages of young star clusters are fundamental clocks to constrain the formation and evolution of pre-main-sequence stars and their protoplanetary disks and exoplanets. However, dating methods for very young clusters often disagree, casting doubts on the accuracy of the derived ages. We propose a new method to derive the kinematic age of star clusters based on the evaporation ages of their stars. The method was validated and calibrated using hundreds of clusters identified in a supernova-driven simulation of the interstellar medium forming stars for approximately 40Myr within a 250pc region. We demonstrate that the clusters' evaporation-age uncertainty can be as small as about 10% for clusters with a large enough number of evaporated stars and small but with realistic observational errors. We have obtained evaporation ages for a pilot sample of ten clusters, finding a good agreement with their published isochronal ages. The evaporation ages will provide important constraints for modeling the pre-main-sequence evolution of low-mass stars, as well as allow for the star formation and gas-evaporation history of young clusters to be investigated. These ages can be more accurate than isochronal ages for very young clusters, for which observations and models are more uncertain.2024A&A...683A.165Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A165CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A165https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A165http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A165https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A165https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A165http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A165GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/683/A165/table1Properties of the clusters considered in this studyNameCluster namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintdDistance to the clusterpcpos.distanceinttCMDCMD age from the PARSEC isochrones used in this workMyrtime.agefloatE_tCMDCMD age upper uncertaintyMyrstat.error;stat.maxfloate_tCMDCMD age lower uncertaintyMyrstat.errorfloattDTDynamical traceback ageMyrpos.parallax.dynfloatE_tDTDynamical traceback age upper uncertaintyMyrstat.error;stat.maxfloate_tDTDynamical traceback age lower uncertaintyMyrstat.errorfloatt*evaCorrected evaporation age determined in this workMyrtime.agefloatE_t*evaCorrected evaporation age upper uncertaintyMyrstat.error;stat.maxfloate_t*evaCorrected evaporation age lower uncertaintyMyrstat.errorfloatsigmapObservational error in positionpcstat.error;pos.distance;posfloatsigmavObservational error in velocitykm/sstat.error;phys.velocfloatR50Core radiuspcphys.size.radiusfloatNstarsNumber of stars used to obtain the CMD and dynamical traceback ages and the starting sample for the evaporation agesmeta.numberintNdivNumber of divergent starsmeta.numberintNevaNumber of evaporated starmeta.numberintNeva70Number of stars used to compute the evaporation agemeta.numberintphievaCorrection factor of the evaporation age (see App. B)arith.factorfloatsigmaevaCorrection factor uncertainty of the evaporation age (see App. B)arith.factorfloatJ/A+A/683/A165/tableb1Values of the medians of phieva and sigmaeva for each error pair in the 1000 Monte-Carlo realizations, in five bins of neva70recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintneva70Lower limit of the n_eva,70 binstat.fit.paramintsigmspTotal observational error in positionpcstat.error;pos.distance;posfloatsigmavTotal observational error in velocitykm/sstat.error;phys.velocfloatphievaScaling factor phi_evaarith.factorfloatsigmaevaStatistical uncertainty sigma_evaarith.factorfloat