J/MNRAS/495/2882ivo://CDS.VizieR/J/MNRAS/495/2882doi:10.26093/cds/vizier.74952882CDSSanchez N.Alfaro E.Lopez-Martinez F.2024-08-21T20:14:46Z2020-06-05T07:12:51ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsIn this work, we improve a previously published method to calculate in a reliable way the radius of an open cluster (OC). The method is based on the behaviour of stars in the proper motion space as the sampling changes in the position space. Here, we describe the new version of the method and show its performance and robustness. Additionally, we apply it to a large number of OCs using data from Gaia second data release to generate a catalogue of 401 clusters with reliable radius estimations. The range of obtained apparent radii goes from Rc=1.4+/-0.1arcmin (for the cluster FSR 1651) to Rc=25.5+/-3.5arcmin (for NGC 2437). Cluster linear sizes follow very closely a lognormal distribution with a mean characteristic radius of Rc=3.7pc, and its high radius tail can be fitted by a power law as N{prop.to}Rc^-3.11+/-0.35^. Additionally, we find that number of members, cluster radius, and age follow the relationship Nc{prop.to}Rc^1.2+/-0.1^.Tc^-1.9+/-0.4^ where the younger and more extensive the cluster, the more members it presents. The proposed method is not sensitive to low density or irregular spatial distributions of stars and, therefore, is a good alternative or complementary procedure to calculate OC radii not having previous information on star memberships.2020MNRAS.495.2882Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/2882CatalogResearchIsServedByTAP 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/MNRAS/495/2882https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/2882http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/2882https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/495/2882https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/495/2882http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/495/2882GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/495/2882/table1 (Catalog of open cluster radii)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/2882/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/2882/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/2882/table1?GETtext/xml+votable180.050000true0.0560.966670.0055555555555555566/1101 1218 1297 1302 1308 1325 1337 1351-1352 1385 1446 1455 1461 1653 1757 1783 1848 1850 1853 1930 3011 3034 3040 3042 3045 3047 3049-3050 3052 3057-3061 3066 3076 3143 3149 3153 3168 3259 3304 3335 3337 3362 3384 3493 3584 3611 3615 3627 3631 3633 3640 3715 3722-3723 3739 3748 3755 3884 4078 12984 12990 13042 13048 13055 13996 14014 14225 14237 14242 14246 14253 14258 14282 14288 14292 14295 14297-14298 14301 14310 14324 14330 14336 14358 14449 14575 14622 14627 14629 14632 14646-14647 14686 14700 14730 14749 14752 15121 15363 15369 15374 15379 15384-15386 15412 15426 15430 15434 15440 15443 15477 15595 15622 15632 15636 15683 15686 15711 15827 20828 20966 21506 21513 21520 21522-21523 21529 21540 21550 21567 21586 21647 21680 21682 21719 22038 22065 22094 22097 22121 22123 22161 22163 22211 22216 22219 22235 22239 22249 22311 22408 22433 23577 23580 23620-23621 23632 23640 23646 23677 23696 23761 23765 23768 23937-23938 24057 24291 24322 24329 24333 24344-24345 24359 24376 24465 24472 24491 24496 24502 24508 24510 24522 24527 28802 28807 28809 28811 28822-28823 28825 28868 28874 28889 28891 28913 28916 29066 29088 29095 29106 29113 29456 29505 29509-29510 29647 30208 30210 30223 30232 30245 30306 30308 30335 30407 30426 30506 30595 30629 30646 30701 30704 30716 32089 37230 37237 37244 37279 37297 37337 37343 37348-37349 37360 37364 37724 37751 37753 37789 37821 37835 37841 37859 37867 37886 37906 37920 37926 37929 37940 38024 38026 38040 38418 38432 38441 38537 38559 39131 39196 39246 39257 39273-39274 39283 39321 39356 39362 39386 39399 39418 39420 39770 39776 39779 39781 39800-39801 39805-39806 39831 39876 39879 39907 39912 39917 39931 39956 39977 40105 40451 40587 40601 40610 40612 40616 40620 40625 40631 40633 40696 41466 41582 41599 41613 41620 41629 41646 41670 41678 41682 41691 41697 41699 41707 41740 41756 41758 41775 41789 41799 41812 41856 41862 41922 42153 42155 42159 42166 42170 42202-42203 42208 42213-42214 42218 42225 42274 42374 42378-42379 42387 42396 42399 42402 42420 42432 42437-42438 42450 42458 42462 42496 42500 43016 43018 43022 43024 43033-43034 43036 43040 43048 43052 43137https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/495/2882?format=asciidefaultJ/MNRAS/495/2882/table1Catalog of open cluster radiiSimbadNameSimbad 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.mainRcAngular cluster radiusarcminphys.angSizefloate_RcUncertainty in Rcarcminstat.errorfloatType[AB] Flag indicating type of solutionmeta.codecharNmEstimated number of kinematic membersmeta.numberintpmRA*Proper motion in right ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloat