J/MNRAS/473/849ivo://CDS.VizieR/J/MNRAS/473/849doi:10.26093/cds/vizier.74730849CDSDib S.Schmeja S.Parker R.J.2024-08-18T20:17:03Z2020-09-17T07:20:19ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clustersgalaxy-classification-systemsWe quantify the structure of a very large number of Galactic open clusters and look for evidence of mass segregation for the most massive stars in the clusters. We characterize the structure and mass segregation ratios of 1276 clusters in the Milky Way Stellar Cluster (MWSC) catalogue containing each at least 40 stars and that are located at a distance of up to ~2kpc from the Sun. We use an approach based on the calculation of the minimum spanning tree of the clusters, and for each one of them, we calculate the structure parameter Q and the mass segregation ratio {LAMBDA}_MSR_. Our findings indicate that most clusters possess a Q parameter that falls in the range 0.7-0.8 and are thus neither strongly concentrated nor do they show significant substructure. Only 27 per cent can be considered centrally concentrated with Q values >0.8. Of the 1276 clusters, only 14 per cent show indication of significant mass segregation ({LAMBDA}_MSR_>1.5). Furthermore, no correlation is found between the structure of the clusters or the degree of mass segregation with their position in the Galaxy. A comparison of the measured Q values for the young open clusters in the MWSC to N-body numerical simulations that follow the evolution of the Q parameter over the first 10Myr of the clusters life suggests that the young clusters found in the MWSC catalogue initially possessed local mean volume densities of {rho}*~=10-100M_{sun}_/pc^3^.2018MNRAS.473..849Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/473/849CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/543/A156 : Milky Way global survey of star clusters (Kharchenko+, 2012)J/A+A/558/A53 : Milky Way global survey of star clusters II (Kharchenko+ 2013)J/A+A/568/A51 : Milky Way global survey of star clusters III (Schmeja+, 2014)J/A+A/581/A39 : MWSC IV. 63 new open clusters (Scholz+, 2015)J/A+A/585/A101 : Milky Way global survey of star clusters V (Kharchenko+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/473/849https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/473/849http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/473/849https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/473/849https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/473/849http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/473/849GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/473/849/table1 (Data for the properties of the MWSC survey used and derived in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/473/849/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/473/849/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/473/849/table1?GETtext/xml+votable180.050000true0.08250.7270.0055555555555555565/3657 3661 3672 6/463 1119 1170 1218 1231 1267 1283 1297 1299 1302 1304 1307 1325 1338 1347 1377 1384-1385 1412 1436 1441 1445-1446 1457 1462 1464 1476 1482 1539 1560 1576 1582 1606 1614 1619 1636 1653 1717 1757 1783 1791 1794 1821 1824 1890 1923 1930 1948 2050 2121 2228 2395 2436 2502 2729 2799 2819 2852 2859 2912 2971 2976 3005 3009 3035 3037-3038 3040 3045 3057-3059 3061 3063 3066 3136 3143 3149 3186 3198 3230 3252 3254 3260-3261 3263 3279 3283 3300 3304 3306-3308 3312 3317 3319 3362 3384 3556 3584 3593 3604 3608 3615 3626-3627 3634 3642 3649 3652 3654 3659 3712-3714 3724 3727 3755 3796 3816 3843 4005 4298 4698 6307 6676 6691 6760 6881 6894 12481 12688 12939 12941 12955 12962 12985 12990 13036 13040 13049-13050 13054 13096 13198 13290-13291 13304 13309 13559 13808 13840 13844 13949 13952 13962 13986 13989-13990 13992 14009 14013-14014 14033 14059 14073-14074 14076 14081 14098 14154 14162 14175 14182 14189 14194 14202-14203 14210 14229 14233 14242 14246 14254 14263-14264 14270 14280 14288 14292 14295-14296 14298 14311-14312 14321-14322 14328 14336 14340 14344 14346 14353 14356 14358 14363 14373 14400 14411 14424-14425 14432 14436 14452 14461 14485 14523 14553 14571 14603-14604 14622-14624 14627 14639-14640 14642-14643 14653 14655 14660 14663 14666 14679 14683 14686 14692 14694 14696-14697 14699-14700 14705 14707 14712 14716 14732 14739 14748-14749 14802 14814 14878 15121 15364 15366 15368-15369 15371 15376-15377 15387 15396 15409-15412 15426 15428 15430 15432-15434 15439-15440 15445 15447-15450 15478 15520 15595 15622 15629 15632-15633 15653 15657 15662 15667 15670-15672 15683 15686-15687 15693 15709 15799 15836 16206 16341 16490 16661 16706 16713 16761 16767 17231 17551 18038 18218 18305 18307-18308 18321 20244 20293 20561 20738 20757 20761 20807 20812 20821-20823 20853-20854 20863 20865 20874 20904 20957 20966 21301 21325 21327 21359 21369 21436 21438-21439 21453 21456 21472 21506 21510 21513 21519-21520 21522-21523 21525 21529 21531 21538 21548-21549 21553 21555 21560 21601 21613 21632 21635 21641 21643 21647 21656-21658 21670-21671 21681-21682 21686 21694 21752 21774 21918 22021 22032-22033 22038 22041 22045 22051 22058 22060 22065 22072 22078 22092 22112 22117 22121 22123 22125 22132 22135 22139 22163 22165 22183 22189 22199 22201 22207 22209 22211 22215-22216 22219 22222 22225-22226 22242 22245-22246 22249 22252-22254 22261 22263-22264 22336 22862 22871 22880 22892-22893 22895 22993 23029 23381 23410 23422 23569 23577 23580 23601 23624 23626 23632-23633 23636-23637 23641 23646 23669 23674 23704 23717 23727 23760 23765 23769-23771 23773 23796-23797 23850 23936 23949-23950 23976-23977 23980 23982 23986 23994 23997-23999 24026 24032 24092 24121 24137-24138 24155 24180 24228 24256 24266 24291 24296 24329 24333 24345 24361 24365 24367 24378 24425 24450 24472 24474 24489 24491 24496 24499 24510 24522 24527 24553-24554 24668 28483 28704 28711 28745 28780 28800 28803 28806-28807 28809-28810 28812 28825 28828 28833 28839 28855 28879 28884 28886 28891-28892 28894 28905 28913 28916-28917 28920 29026-29027 29032 29035 29078 29081-29082 29088-29089 29095 29102 29109 29113 29115-29116 29154 29162 29166 29183 29207 29269 29334 29373 29391 29456 29460 29463 29498 29509 29511 29513 29516 29520 29523 29533 29594 29711 29728 29771 29779 29868 29997 30125 30174 30208 30210 30215 30218 30221 30240 30245 30247 30256-30257 30306 30335 30407 30427-30428 30439 30472 30506 30542 30595 30622 30635 30648 30653 30664 30692-30693 30704 30716 31071 31142 31756 31780 31790 31812 31865 32089 32111 32131 32139 32227 32402 32612 32778 32802 32899 32931 32933 32937 33099 33131 33292 33412 33463 33514 33856 34536 34924 35002 35058 35204 35422 35535 35540 35550 35625 35630 35723 35744 35748 36951 36956 36962 36971 36975 37034 37074 37077 37109 37178 37196 37230-37231 37270 37272 37277 37297 37303 37324 37326 37329 37332 37334 37337 37340-37341 37343 37349 37351 37360-37362 37364-37365 37368 37370-37371 37373 37375 37523 37592 37594 37659 37693 37697 37705 37708-37709 37712-37713 37715 37717 37719 37721 37723 37737 37744-37745 37750 37752-37753 37756 37789-37790 37827 37836 37839 37841 37849 37851-37852 37859 37861 37865 37867-37869 37874 37876 37883 37885-37886 37892 37895 37900-37901 37904 37906-37908 37913-37914 37919-37920 37923 37926 37928-37929 37932-37934 37938 37940 37942 37956 37962 37971 37992 38018 38021 38023-38024 38027 38032 38041 38048 38051-38052 38073 38166 38216 38242 38302 38412 38432 38526-38528 38560 38571 38585 38605 38627 38956 38977 39005 39015 39154 39177 39181 39193 39233 39236-39237 39243-39246 39248-39249 39251 39254 39259 39262 39276 39278 39282-39283 39288 39290 39294 39311 39323 39326 39356 39362 39374-39375 39384-39386 39400 39406 39696-39697 39709 39714 39726 39739 39746-39747 39752 39760-39761 39768 39774-39775 39779 39785 39795-39796 39805-39806 39831-39832 39845 39858 39867 39869 39874 39877 39879 39883 39895 39907 39910 39912-39913 39917 39920-39921 39930-39931 39934 39968 39976 40030 40082 40104 40106 40116 40459 40490 40498 40580 40586-40587 40601 40616 40618 40620 40625 40696 40974 40987 41008 41097 41230 41252 41342 41389 41393 41432 41443 41445 41453 41455 41461 41466 41550 41558 41565 41577 41580 41582 41598-41599 41610 41614-41615 41620-41621 41628 41633 41638 41646 41652-41653 41656 41667 41669-41670 41673-41676 41678 41682 41687-41688 41691-41692 41694 41696 41698-41699 41701-41703 41706 41708-41710 41712 41714 41716 41730 41738 41740 41747 41750 41756 41758 41762 41768 41770-41771 41775 41779-41780 41782-41783 41789 41799 41801 41807 41809 41813 41817 41819 41821-41823 41829 41832 41834 41846 41857-41859 41863 41866-41867 41869 41878 41893 41904 41919 41928 41995 42029 42056 42135 42147 42153 42155 42159 42163-42164 42166 42172 42176-42177 42185 42192 42202-42203 42207 42209-42210 42213-42214 42216 42218 42225 42227 42231 42236 42268 42274 42303 42349 42353 42364-42365 42367 42370 42374 42376-42377 42379 42391 42394 42396 42399 42402 42405 42417 42420-42421 42432 42435 42437 42448 42452 42456 42458 42464-42465 42470 42486 42498 42500 42506-42507 42511 42516 42548 42583 42651 42730 42744 42846 42851 42907 42912 42915 42964 43009 43012 43014 43018-43019 43021-43024 43027 43033 43036 43040 43044-43045 43047-43048 43050 43052 43066 43086 43117 43136-43137 43140 43301 43341 43569 43724 43780 45072 45121 45628 45747 47234 47326 47373 47621 47704 47721 47748 47858 47926 48015 48058 48102 48852 48893https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/473/849?format=asciiOpticaldefaultJ/MNRAS/473/849/table1Data for the properties of the MWSC survey used and derived in this studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMWSCNumber in the MWSC cataloguemeta.idintClustername of the clustermeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatDistDistance from the Sunpcpos.distance;pos.heliocentricintlogAgeAgelog(yr)time.agefloatRcore? Core radiuspcphys.size.radiusfloatnullableRtidal? Tidal radiuspcphys.size.radiusfloatnullableNstarsNumber of starsmeta.numberintDistcDistance to the Galactic centrepcpos.distance;pos.galactocentricintDistpDistance to the Galactic planepcpos.distanceintQQ parameter (1)src.morph.paramfloatLJ10Lambda^J_10^ MSR parameter (2)stat.fit.paramfloatGJ10Gamma^J_10^ MSR parameter (3)stat.fit.paramfloatSimbadSimbad column added by the CDSmeta.ref.urlchar