J/A+A/687/A291ivo://CDS.VizieR/J/A+A/687/A291doi:10.26093/cds/vizier.36870291CDSHu Q.Zhang Y.Qin S.Zhong J.Chen L.Luo Y.2024-11-29T20:04:03Z2024-07-22T08:46:36ZCDS support team

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

cds-question@unistra.fropen-star-clustersgalaxy-classification-systemsvisible-astronomyThe morphology of open clusters plays a major role in the study of their dynamic evolution. The study of their morphological coherence, namely, the three-dimensional (3D) difference between the inner and outer morphologies of open clusters, allows us to obtain a better understanding of the morphological evolution of open clusters. We aim to investigate the morphological coherence of 132 open clusters with up to 1kpc from the Sun in the three-dimensional (3D) space within the heliocentric cartesian coordinate frame. The 132 open clusters have a 3D core-shell structure and conform to the ellipsoidal model, with all of them coming from a catalog of publicly available clusters in the literature. We employed the ellipsoid fitting method to delineate the 3D spatial structure of the sample clusters, while using the morphological dislocation (MD) defined in our previous work and the ellipticity ratio (ER) of the clusters' inner and outer structures to characterize the morphological coherence of the sample clusters. The results show an inverse correlation between the ER of the sample clusters and the number of their members, indicating that sample clusters with a much more elliptical external morphology than internal shape generally tend to host a large number of members. Meanwhile, a slight shrinking of the MD of the sample clusters with their members' number may shed light on the significant role of the gravitational binding of the sample clusters in maintaining their morphological stability. Moreover, there are no correlations between the MD and ER of the sample clusters and their age. They are also not significantly correlated with the X-axis, the Y-axis, their orbital eccentricities, and the radial and vertical forces on them. However, the ER of the sample clusters displays some fluctuations in the distributions between it and the above covariates, implying that the morphologies of the sample clusters are sensitive to the external environment if sample effects are not taken into account. Finally, the analysis of the 3D spatial shapes of sample clusters with a small ER or a large ER demonstrates that the number of members lays an important foundation for forming a dense internal system for sample clusters. At the same time, the MD of the sample clusters can serve well as an indicator of their morphological stability, which is built upon a certain amount of member stars. We present a new insight into the morphological coherence of open clusters, attributed to the combination of their gravitational binding capacity and external environmental perturbations.2024A&A...687A.291Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A291CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/660/A4 : Gaia EDR3 new Galactic open clusters (Hao+, 2022)J/A+A/673/A114 : Improving the open cluster census. II. (Hunt+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/687/A291https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/687/A291http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/687/A291https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/687/A291https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/687/A291http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/687/A291GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/687/A291/tablea1 (Overall parameters of clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A291/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A291/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A291/tablea1?GETtext/xml+votable180.050000true81.330.370.0055555555555555566/463 1199 1208 1560 2382 2395 2436 3005 3136 3186 3283 3317 3604 3796 3849 3878 4698 6760 13729 13952 13962 14058 14098 14164 14317 14363 14390 14401 14431 14689 14791 14812 15369 15376 15396 15432 15695 15709 15731 16144 16490 20764 20797 21267 21438 21471 21495 21504 21529 21531 21658 21668 21774 21927 22035 22585 22859 22892-22893 22895 23376 23538 23717 24228 24291 24345 28483 28711 28806 29027 29156 29269 29653 29728 30254 30366 30439 31071 31756 31812 31864 31991 37109 37231 37297 37316 37592 37624 37659 37790 37933 38018 38051 38973 39033 39154 39191 39276 39297 39354 39484 39548 39658 39714 39739 39775 39871 41312 41445 41461 41558 41747 41816 41834 41846 41863 42024 42147 42274 42290 42415 42464 42583 42983 42988 43031 43064 43529 44360 44378 44389 47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/687/A291?format=asciiOpticaldefaultJ/A+A/687/A291/tablea1Overall parameters of clustersSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainNpge0.5Number of sample cluster members with probability more than or equal to 0.5meta.numberintlogtCluster agelog(yr)time.agefloatXCluster X coordinate within heliocentric Cartesian coordinates framepcpos.frame;pos.heliocentricfloatYCluster Y coordinate within heliocentric Cartesian coordinates framepcpos.frame;pos.heliocentricfloatZCluster Z coordinate within heliocentric Cartesian coordinates framepcpos.frame;pos.heliocentricfloatdMorphological dislocationsrc.morph.paramfloate_dError of morphological dislocationstat.errorfloatellEllipticity ratio (ecore/eouter)phys.size.axisRatiofloate_ellError of ellipticity ratiostat.errorfloatFRRadial force (in 2piGM/pc+2 unit)stat.fit.paramfloate_FRError of radial force (in 2piGM/pc+2 unit)stat.errorfloatFzVertical force (in 2piGM/pc+2 unit)stat.fit.paramfloate_FzError of vertical force (in 2piGM/pc+2 unit)stat.errorfloateccOrbital eccentricitysrc.orbital.eccentricityfloate_eccError of orbital eccentricitystat.errorfloat