J/A+A/645/A84ivo://CDS.VizieR/J/A+A/645/A84doi:10.26093/cds/vizier.36450084CDSMeingast S.Alves J.Rottensteiner A.2023-02-08T11:36:12Z2021-01-18T07:46:19ZCDS support team

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

cds-question@unistra.frstellar-associationsmilky-way-galaxyastrometrystellar-distanceWe present a novel view on the morphology and dynamical state of ten prominent, nearby (<=500pc), and young (~30-300Myr) open star clusters with Gaia DR2: Per, Blanco 1, IC 2602, IC 2391, Messier 39, NGC 2451A, NGC 2516, NGC 2547, Platais 9, and the Pleiades. We introduce a pioneering member-identification method that is informed by cluster bulk velocities and deconvolves the spatial distribution with a mixture of Gaussians. Our approach enables inferring the true spatial distribution of the clusters by effectively filtering field star contaminants while at the same time mitigating the effect of positional errors along the line of sight. This first application of the method reveals vast stellar coronae that extend for >~100pc and surround the cluster cores, which are comparatively tiny and compact. The coronae and cores form intertwined, coeval, and comoving extended cluster populations, each encompassing tens of thousands of cubic parsec and stretching across tens of degrees on the sky. Our analysis shows that the coronae are gravitationally unbound but largely comprise the bulk of the stellar mass of the populations. Most systems are in a highly dynamic state, showing evidence of expansion and sometimes simultaneous contraction along different spatial axes. The velocity field of the extended populations for the cluster cores appears asymmetric but is aligned along a spatial axis unique to each cluster. The overall spatial distribution and the kinematic signature of the populations are largely consistent with the differential rotation pattern of the Milky Way. This finding underlines the important role of global Galactic dynamics in the fate of stellar systems. Our results highlight the complexity of the Milky Way's open cluster population and call for a new perspective on the characterization and dynamical state of open clusters.2021A&A...645A..84Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/645/A84CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/645/A84https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/645/A84http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/645/A84https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/645/A84https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/645/A84http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/645/A84GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/645/A84/coronae (Cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/A84/coronae?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/A84/coronae?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/A84/coronae?GETtext/xml+votable180.050000true56.1171007219.184819850.0055555555555555564/28 30 110 196 2332 2349 2351 5/90-91 94 116 118 124 126 209 212 221 316-317 411-412 431 433 435-436 444 446 457 752 772-773 775 781 783 3503 3514-3515 3518-3519 3844-3845 4111 4113 4120 4122 4135 4144 8891 8894 9300 9302-9303 9305-9310 9325 9327 9332 9369-9372 9374 9393 9395 9421-9422 9445-9447 9449-9454 9469 9474 9615 9633-9635 9637 9640 9645 9749 9793 9795-9798 9801-9804 9806 9811 9813 9825 9827-9828 9830 9835-9836 9838-9839 9921 9924-9925 9927 9933 9935 9938 9944 9946 9969-9971 9979 10754 6/319 324 329 332-333 337-338 351 353 355-356 359 368-369 373-375 380 382 404-405 407 413-414 436-437 439 441 443 446-447 468-470 476 478-479 500 503 509-511 789 791 793 797 799 817 832 834-835 845 856 862 864 866-868 870 877 879-880 882 890-891 961 966-967 969 972-974 978 980 982-983 985 987 989-990 1004-1005 1009 1011 1013-1014 1016 1019 1032 1058 1068 1118 1122-1123 1160 1162 1164 1169 1180 1183 1191 1193 1197-1198 1210 1212 1214-1215 1219 1222 1225 1227-1228 1230 1236 1239 1243-1244 1246-1247 1251 1254-1256 1259 1263 1272 1274 1276 1279 1288 1323 1342 1354 1371 1414 1418-1419 1422 1429 1432 1438 1443 1445 1449 1454-1455 1457-1458 1467 1473 1483 1509-1510 1514 1536 1540-1541 1543 1547 1551 1553 1556 1561-1562 1564-1566 1571-1572 1574 1581 1584 1586 1591 1593 1595 1599-1600 1603 1608-1609 1611-1613 1615 1617 1620 1622-1624 1627-1630 1635-1636 1638-1640 1642-1643 1653-1658 1660-1662 1664 1667-1670 1674 1681 1683 1687-1688 1690-1693 1695-1696 1702-1703 1705 1707-1708 1712 1714 1717 1719-1720 1722-1723 1728 1730-1731 1737-1739 1748-1750 1752-1754 1759 1780 1783 1788 1791 1794-1796 1799-1800 1802 1804 1806 1826-1827 1834 1837 1846 1849 1862 1920-1921 1923-1924 1926 1931 1952 1954 2374 2382 2384-2386 2390 2419 2424 2513-2516 2519-2520 2524 2526 2544 2548 2550 2554-2556 2834 2864 2876 2890 2897 2903 2906 2908 2911 2919 2932-2933 2937 2943 2963 2965 2967 2971-2972 2988 2991 2997-2999 3005 3007 3012 3014 3019-3021 3024-3025 3028 3031 3034 3042-3043 3045 3053 3056-3057 3068-3069 3072 3075 3077 3081 3097-3099 3105-3106 3109-3111 3113 3115 3117-3121 3123 3130-3131 3152 3155-3156 3159-3160 3162 3168-3170 3172 3176 3178-3180 3182-3183 3192 3194 3196 3200 3203 3205 3207-3209 3212-3213 3215-3217 3220-3222 3225 3228 3230 3233-3236 3238 3242 3250-3251 3253-3257 3259 3261 3264 3268 3274 3278 3280-3281 3284 3286 3288-3290 3293 3296 3298-3299 3303 3305-3306 3314 3320-3321 3328 3586 3588-3590 3595-3596 3600-3601 3605 3609 3614 3621 3625 3627 3630-3632 3640-3641 3648 3655 3657 3688-3689 3717 3723 3729 3731 3748 13995 13997-13999 14008 14010-14011 14048 14050-14051 14053 14055 14064 14066-14068 14070-14071 14175 14207 14218 14241 14243 14245-14247 14292 14303 15361 15364-15365 15367 15373 15424-15425 15427-15429 15431 15442 16411 16415 16435 16437 16439 16443 16450 16456 16458-16462 16464-16465 16472 16486-16487 16492 16494 16533-16536 16560 16566 16568 16571-16573 16580 16582 16584-16586 16593 16608 16611 16614 16616 16620 16918 16925 16927 16949 16960 16963 16968 20801 20804-20806 20819 23534 24197 24204 24210 24225 24241 24489 24569 32769 32776 32784-32785 32790 32796 32833 32837 32849 32851-32852 35510-35511 35519 35526 35528 35534-35535 35538-35539 35544 35552-35553 35556-35557 35561 35568 36866 36878 36897 36902 36907-36908 36989 36992-36993 36996 37001 37003 37007-37008 37017 37019 37022 37026 37032 37034 37040-37041 37044 37046 37048 37052 37058 37064 37074 37083 37088-37089 37091 37094 37096-37098 37119 37135 37140 37142-37143 37148-37149 37153 37158 37161 37167-37168 37171-37172 37174 37176 37179 37182-37183 37185 37188 37195 37197 37199 37206-37207 37218-37219 37244 37246-37247 37249 37261 37263-37265 37267 37269-37274 37276 37278-37279 37284 37286-37288 37297-37299 37305-37307 37335-37336 37338-37339 37344-37345 37348-37350 37354-37355 37357-37358 37360 37362 37371 37375 37391 37396-37398 37406-37407 37415 37417 37421 37424 37426 37429 37432 37434 37440 37442-37443 37446-37448 37450-37452 37454-37455 37458-37459 37464 37466-37467 37471 37474-37475 37493 37501 37569 37571 37576-37577 37601 37604-37605 37607 37634 37639 37641-37643 37647 37649-37652 37655 37657-37659 37661-37664 37667-37668 37671 37674 37677-37681 37683 37693-37697 37700-37701 37704 37706-37707 37709 37711-37712 37714 37716 37718 37724 37728-37729 37731-37732 37736 37738 37746 37752-37753 37758 37760 37762-37763 37765-37767 37769 37772-37773 37775-37776 37778-37779 37794-37795 37820-37821 37823 37825-37826 37828 37830 37832 37834-37835 37841 37845 37849 37852-37853 37855-37858 37865-37867 37870 37875 37885-37887 37889-37890 37892 37895 37902-37905 37914 37920 37922-37924 37926-37929 37931 37934 37937 37958 37965 37989 38007 38012 38016 38059 38070 38079 38127-38128 38158 38176-38177 38179 38189 38195 38221 38279 38281 38286-38287 38307 38415 38426 38429 38432 38436-38437 38445 38447-38448 38454-38458 38472-38473 38477-38478 38485 38498-38499 38501 38503-38504 38506-38508 38529 38531 38544 38547 38552-38553 38555 38558-38559 38564 38566-38569 38571-38573 38576-38577 38579 38585 38588-38590 38592-38594 38597-38598 38600 38620 38624-38625 38627 38634 38662 38665 38689 38789 38992 38995 39001 39004-39005 39025 39031 39036-39038 39120 39124-39125 39127 39129-39130 39134-39136 39138-39139 39145-39147 39153 39155-39158 39165 39168-39169 39171 39177-39179 39196 39198-39199 39201-39203 39222 39230-39231 39233 39237 39240-39241 39248-39249 39251 39259-39260 39269 39271 39283-39286 39289 39296 39298-39299 39304 39306 39316 39324 39326 39329 39331 39333-39335 39337 39348 39350 39360 39364 39380 39401-39402 39405 39419 39484 39489 39491 39493 39495 39500-39501 39503 39513-39514 39524-39525 39541 39546 39682-39683 39689 39692-39694 39704-39706 39729 39731 39746 39758 39764 39768-39769 39773 39775 39780 39782 39789-39791 39800 39802 39806 39813 39821 39823-39826 39831 39837 39874-39875 39888 39896 39898 39904-39906 39909-39910 39913-39915 39920 39922-39923 39928-39929 39934 39936-39938 39940 39946 39960 39972 40008 41107 41139 41141 41146 41158 41165 41174 41182 41185-41186 41191 41255 41273 41279 41361 41481-41483 41494 41503 41507 41511 41514 41525 41531-41532 41569 41582 41601 41606 41615 41618-41619 41624 41626 41632 41635 41637 41648 41650 41659 41664 43010 43012 43014-43015 43020 43028 43040-43041 43043https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/645/A84?format=asciidefaultJ/A+A/645/A84/coronaeCluster membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 Unique source identifier (source_id)meta.id;meta.mainRA_ICRSGaia DR2 Right ascension (ICRS) at ep=2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 Declination (ICRS) at ep=2015.5degpos.eq.dec;meta.mainDist(raw)Distance computed as 1/parallaxpcpos.distance;pos.heliocentricfloatDist(xd)Distance inferred from deconvolutionpcpos.distance;pos.heliocentricfloatUVel? Galactic space velocity Ukm/sphys.veloc;pos.cartesian.xdoublenullableVVel? Galactic space velocity Vkm/sphys.veloc;pos.cartesian.yfloatnullableWVel? Galactic space velocity Wkm/sphys.veloc;pos.cartesian.zfloatnullablefcFractional contaminationstat.fit.paramdoubleClusterCluster name (1)meta.id.parentcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (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.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (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.decnullableindexed