J/A+A/689/A268ivo://CDS.VizieR/J/A+A/689/A268doi:10.26093/cds/vizier.36890268CDSViscasillas Vazquez C.Magrini L.Miret-Roig N.Wright N.J.Alves J.,Spina L.Church R.P.Tautvaisiene G.Randich S.2025-05-06T20:01:08Z2024-09-20T09:51:11ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersastrometryStar clusters, composed of stars born from the same molecular cloud, serve as invaluable natural laboratories for understanding the fundamental processes governing stellar formation and evolution. This study aims to investigate correlations between the Mean Interdistance ({bar}D_i_), Mean Closest Interdistance ({bar}D_c_) and Median Weighted Central Interdistance ({bar}D_cc_) with the age of star clusters, examining their evolutionary trends and assessing the robustness of these quantities as possible age indicators. We selected a sample of open clusters in the solar region and with a representative number of members (e.g. well populated and without outliers). The interdistances are derived from the spatial distribution of member stars within a cluster. Their evolution over time allows us to use them as an age indicators for star clusters. Our investigation reveals a high-significant correlation between the interdistances and cluster age. Considering the full sample of clusters between 7 and 9kpc, the relationship is very broad. This is due to uncertainties in parallax, which increase with increasing distance. In particular, we must limit the sample to a maximum distance from the Sun of about 200pc to avoid artificial effects on cluster shape and on the spatial distribution of their stars along the line of sight. By conservatively restraining the distance to a maximum of ~200pc, we have established a relationship between the interdistances and the age of the clusters. In our sample, the relationship is mainly driven by the internal expansion of the clusters, and is marginally affected by external perturbative effects. Such relation might enhance our comprehension of cluster dynamics and might be used to derive cluster dynamical ages.2024A&A...689A.268Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/689/A268CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/167/12 : Open cluster parameters with ANN (Cavallo+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/689/A268https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/689/A268http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/689/A268https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/689/A268https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/689/A268http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/689/A268GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/689/A268/tablea1 (Main properties of the final of 81 open clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/689/A268/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/689/A268/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/689/A268/tablea1?GETtext/xml+votable180.050000true348.652263957.26469390.0055555555555555566/907 1072 1168 1244 1414 2785 3194 4992 5591 9767 10059 11428 11774 14278 14406 14786 15430 16029 18676 19383 20223 20643 21084 21211 21956 22096 22633 22650 22743 22789 22873 22925 23029 23083 23673-23675 23677-23678 23769-23770 23846 24212 24232 24620 25137 28481 29082 29120 29623 31596 33173 34219 36161 36957 37231 37312 37641 37819 37822 37914 37924-37925 38485 39112 39290 39354 39571 39631 42268 42619 43002 43012 43148 44310 44361 44378 45742 47834https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/689/A268?format=asciidefaultJ/A+A/689/A268/tablea1Main properties of the final of 81 open clusters_DEPositions from Cavallo et al.(2024, Cat. J/AJ/167/12) (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharDiMean interdistancekpcpos.distancefloatDcMean closest interdistancekpcpos.distancefloatDccMedian weighted central interdistancekpcpos.distancefloatAgeCluster age from Cavallo et al. (2024AJ....167...12C)Gyrtime.agefloatRgcCluster galactocentric distance from Cavallo et al. (2024AJ....167...12C)kpcpos.distance;pos.galactocentricfloateEccentricitysrc.orbital.eccentricityfloatZmaxMaximun height from the Galactic planekpcpos.cartesian.zfloatPC1First Principal Componentphot.color;em.opt;em.optfloatPC2Second Principal Componentphot.color;em.opt;em.optfloatPC3Third Principal Componentphot.color;em.opt;em.optfloat_RAPositions from Cavallo et al.(2024, Cat. J/AJ/167/12) (right ascension part)degpos.eq.ra;meta.main