J/A+A/699/A122ivo://CDS.VizieR/J/A+A/699/A122doi:10.26093/cds/vizier/bc-nv/lbccCDSOlivares J.Miret-Roig N.Galli P.A.B.Bouy H.2026-08-03T06:55:20Z2025-07-04T08:06:57ZCDS support team

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

cds-question@unistra.frstellar-associationsvisible-astronomytrigonometric-parallaxastrometryLocal young stellar associations (LYSAs <50Myr and <150pc) are important laboratories to test predictions from star formation theories. Estimating their ages through various dating techniques with minimal biases is thus of paramount importance. Aims. We aim to determine the ages of LYSAs with the expansion rate dating technique. We estimated the ages of the LYSAs using literature membership lists, publicly available data (astrometry and radial velocities), and a recent open-source Bayesian code that implements the expansion rate method. This code in combination with simple statistical assumptions allowed us to decontaminate, identify possible substructures or populations, and estimate expansion ages. We derive the largest and most methodological homogeneous set of ages of LYSAs. We rediscover three and discover four associations hidden within the literature membership lists of the classical ones. The expansion ages we report here are compatible with literature age estimates. Moreover, our analysis shows that previous age tensions can be explained, in most cases, by the presence of unidentified populations or substructures.2025A&A...699A.122Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A122CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A122https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/699/A122/tableb2Parameters inferred for each stellar associationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStatName of the statistic estimatormeta.idcharloc[X]Galactic coordinate Xpcmeta.id;meta.maindoublew5w5 non-isotopic dilatation parameter (2)m.s**-1.pc**-1stat.fit.paramdoubleAssocAbbreviated name of the associationmeta.id.part;meta.maincharMembAbbreviated name of the membership list (G1)meta.id.part;meta.maincharRVoriAbbreviated name of the RV originmeta.id.part;meta.maincharloc[Y]Galactic coordinate Ypcpos.cartesian.y;pos.galacticdoubleloc[Z]Galactic coordinate Zpcpos.cartesian.z;pos.galacticdoubleloc[U]Galactic velocity Ukm/sphys.veloc;pos.cartesian.xdoubleloc[V]Galactic velocity Vkm/sphys.veloc;pos.cartesian.ydoubleloc[W]Galactic velocity Wkm/sphys.veloc;pos.cartesian.zdoublestdloc[X]Dispersion of coordinate Xpcstat.variancedoublestdloc[Y]Dispersion of coordinate Ypcstat.variancedoublestdloc[Z]Dispersion of coordinate Zpcstat.variancedoublestdloc[U]Dispersion of velocity Ukm/sstat.variancedoublestdloc[V]Dispersion of velocity Vkm/sstat.variancedoublestdloc[W]Dispersion of velocity Wkm/sstat.variancedoublecorr-pos[XX]Correlation of coordinates X and Xstat.correlationfloatcorr-pos[XY]Correlation of coordinates X and Ystat.correlationdoublecorr-pos[XZ]Correlation of coordinates X and Zstat.correlationdoublecorr-pos[YX]Correlation of coordinates Y and Xstat.correlationdoublecorr-pos[YY]Correlation of coordinates Y and Ystat.correlationfloatcorr-pos[YZ]Correlation of coordinates Y and Zstat.correlationfloatcorr-pos[ZX]Correlation of coordinates Z and Xstat.correlationdoublecorr-pos[ZY]Correlation of coordinates Z and Ystat.correlationfloatcorr-pos[ZZ]Correlation of coordinates Z and Zstat.correlationfloatcorr-vel[UU]Correlation of velocities U and Ustat.correlationfloatcorr-vel[UV]Correlation of velocities U and Vstat.correlationfloatcorr-vel[UW]Correlation of velocities U and Wstat.correlationdoublecorr-vel[VU]Correlation of velocities V and Ustat.correlationfloatcorr-vel[VV]Correlation of velocities V and Vstat.correlationfloatcorr-vel[VW]Correlation of velocities V and Wstat.correlationdoublecorr-vel[WU]Correlation of velocities W and Ustat.correlationdoublecorr-vel[WV]Correlation of velocities W and Vstat.correlationdoublecorr-vel[WW]Correlation of velocities W and Wstat.correlationfloatkappaMean value of all three components of the expansion ratem.s**-1.pc**-1stat.fit.paramdoublekappaXKappa component in Galactic Xm.s**-1.pc**-1stat.fit.paramdoublekappaYKappa component in Galactic Ym.s**-1.pc**-1stat.fit.paramdoublekappaZKappa component in Galactic Zm.s**-1.pc**-1stat.fit.paramdoubleomegaNorm of the rotation vector omegam.s**-1.pc**-1stat.fit.paramfloatomegaXOmega component in Galactic X (2)m.s**-1.pc**-1stat.fit.paramdoubleomegaYOmega component in Galactic Y (2)m.s**-1.pc**-1stat.fit.paramdoubleomegaZOmega component in Galactic Z (2)m.s**-1.pc**-1stat.fit.paramdoublew1w1 non-isotopic dilatation parameter (2)m.s**-1.pc**-1stat.fit.paramdoublew2w2 non-isotopic dilatation parameter (2)m.s**-1.pc**-1stat.fit.paramdoublew3w3 non-isotopic dilatation parameter (2)m.s**-1.pc**-1stat.fit.paramdoublew4w4 non-isotopic dilatation parameter (2)m.s**-1.pc**-1stat.fit.paramdoubleJ/A+A/699/A122/tableb3List of members for each stellar associationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAssocAbbreviated name of the associationmeta.id.part;meta.maincharMembAbbreviated name of the membership list (G1)meta.id.part;meta.maincharRVoriAbbreviated name of the RV originmeta.id.part;meta.maincharGaiaDR3Gaia DR3 source identifiermeta.id