J/A+A/698/A156ivo://CDS.VizieR/J/A+A/698/A156doi:10.26093/cds/vizier/bc-nt/lbfgCDSXu M.Fu X.Chen Y.Li L.Fang M.Zhao H.Liu P.Zuo Y.2026-08-03T06:54:50Z2025-06-12T08:48:15ZCDS support team

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

cds-question@unistra.fropen-star-clustersOpen clusters offer unique opportunities to study stellar dynamics and evolution under the influence of their internal gravity, the Milky Way's gravitational field, and the interactions with encounters. Using the Gaia DR3 data for a catalog of open clusters within 500 parsecs that exhibit tidal features reported by the literature, we apply a novel method based on 3D principal component analysis to select a "golden sample" of nearby open clusters with minimal line-of-sight distortions. This approach ensures a systematic comparison of 3D and 2D structural parameters for tidally perturbed clusters. The selected golden sample includes Blanco 1, Melotte 20, Melotte 22, NGC 2632, NGC 7092, NGC 1662, Roslund 6 and Melotte 111. We analyze these clusters by fitting both 2D and 3D King Profiles to their stellar density distributions. Our results reveal systematic discrepancies, with most of the golden sample clusters exhibiting larger 3D tidal radii compared to their 2D counterparts, demonstrating that the 2D projection effects bias the measured cluster size. Furthermore, the 3D density profiles show stronger deviations from King profiles at the tidal radii ({Delta}{rho}_3D_>{Delta}{rho_2D_), highlighting enhanced sensitivity to tidal disturbances. Additionally, we investigate the spatial distribution of cluster members relative to their bulk motion in the Galactic plane. We find that some clusters exhibit tidal features oriented perpendicular to their direction of motion, which can be attributed to the fact that the current surveys only detect the curved inner regions of the tidal features. In conclusion, this work offers a golden sample of nearby open clusters that are most reliable for 3D structure analysis and underscores the necessity of 3D analysis when characterizing OC morphological asymmetries, determining cluster size, and identifying tidal features.2025A&A...698A.156Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/698/A156CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 (Gaia Collaboration, 2022)J/A+A/659/A59 : Structural parameters of 389 local open clustershttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/698/A156https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/698/A156http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/698/A156https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/698/A156https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/698/A156http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/698/A156GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/698/A156/table1 (Cluster parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/698/A156/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/698/A156/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/698/A156/table1?GETtext/xml+votable180.050000true51.804834.94560.0055555555555555566/463 1072 1119 1218 1276-1277 1283 1296-1297 1302 1311 1318 1326 1347 1381 1386 1445 1464 1557 1576 1582 1661 1717-1718 1757 1794 1807 1825 1890 1913 1923 1930 1970 2373 2381 2395 2436 2463 2517 2785 2859 2994 3009 3035 3038 3055 3066 3136 3145 3201 3230 3259 3283 3306 3308 3553 3584 3593 3604 3608 3613 3626 3636 3654 3680 3684 3712 3752 3783 3796 4298 4698 6307 6760 6869 6881 6894 12824 12891 12995 13055 13096 13198 13279 13286 13304 13874 13952 13982 13992 14013 14033 14059 14065 14070 14098 14103 14129 14134 14162 14182 14209-14210 14229 14259 14267 14285 14306 14346 14363 14370 14373 14384 14391 14403-14404 14410 14418 14553 14571 14598 14603 14642 14689 14697 14725 14732 14751 14816 15121 15226 15366 15369 15389 15396 15412 15520 15568 15617 15622 15640 15650 15706 15709 15808 15828 16490 20797 20853 20951 20957 20966 21328 21369 21495 21509-21510 21520 21523 21529 21531 21538 21549 21561 21584 21639 21647 21656 21658 21682 21691 21774 21924 21984 22021 22030 22032 22034 22053 22084 22098 22112 22123 22146 22183 22314 22871 23027 23410 23633 23784 23982 24032 24130 24228 24291 24333 24345 24367 24399 24423 24522 28481 28709 28711 28745 28800 28807 28818 28838 28901 28916 28976 28997 29032-29033 29035 29081-29082 29088 29101 29108 29115 29121 29144 29154 29156 29158 29168 29173 29180 29269 29497-29498 29517 29653 29728 29779 29865 29874 29894 29915 30114 30223 30234 30243 30247 30249 30309 30439 30567 30626 30635 30686 30696 30717 31071 31812 31847 32017 32066 32111 32126 33099 37109 37200 37224 37252 37326 37351 37592 37594 37672 37679 37705 37725 37737 37745 37755 37789 37810 37845 37859 37892 37920 37926 37933 37947-37948 38021 38051 38119 38140 38242 38561-38562 38632 39005 39016 39154 39172 39179 39210 39236 39244 39257 39270 39290 39356 39374 39397 39775 39871 39894 39901 39912 39929 39963 40490 40696 40878 41312 41381 41436 41445 41461 41553 41564 41595 41599 41633 41688 41692 41703 41771 41816 41829 41834 41846 41863 41878 41893 41995 42029 42046 42135 42147 42162 42197 42203 42216 42229 42269 42274 42353 42364 42420 42456 42464 42469-42470 42503 42522 42548 42583 42847 42850 43024 43036 43044 43050 43062 43136-43137 43191 43218 43301 47621 47784 47854 49097https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/698/A156?format=asciidefaultJ/A+A/698/A156/table1Cluster parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name (1)meta.id;meta.maincharGLON0Mean Galactic longitude (l_0) (1)degpos.galactic.lonGLAT0Mean Galactic latitude (b_0) (1)degpos.galactic.latX0Median Galactocentric Cartesian X coordinate (X_0)pcpos.cartesian.x;pos.galacticfloatY0Median Galactocentric Cartesian Y coordinate (Y_0)pcpos.cartesian.y;pos.galacticfloatZ0Median Galactocentric Cartesian Z coordinate (Z_0)pcpos.cartesian.z;pos.galacticfloatmPCA first principal axis m vector (m)stat.fit.paramfloatnPCA first principal axis n vector (n)stat.fit.paramfloatpPCA first principal axis p vector (p)stat.fit.paramfloatphiAngle between the PCA axis and line-of-sight (phi)degstat.fit.paramfloatNstarNumber of members (N_star) (1)meta.numberintlogAgeCluster age (logt) (logAge(yr)) (1)log(yr)time.agefloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedSimbadNameSimbad column added by the CDSmeta.idcharnullable