J/A+A/623/A112ivo://CDS.VizieR/J/A+A/623/A112doi:10.26093/cds/vizier.36230112CDSDamiani F.Prisinzano L.Pillitteri I.Micela G.Sciortino S.2019-03-21T11:09:22Z2019-03-13T07:43:03ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsstellar-associationsvisible-astronomytrigonometric-parallaxproper-motionsThe Sco OB2 association is the nearest OB association, extending over approximately 2000 square degrees on the sky. Only its brightest and most massive members are already known (from HIPPARCOS) across its entire size, while studies of its lower mass population refer only to small portions of its extent. In this work we exploit the capabilities of Gaia DR2 measurements to search for Sco OB2 members across its entire size and down to the lowest stellar masses. We used both Gaia astrometric (proper motions and parallaxes) and photometric measurements (integrated photometry and colors) to select association members, using minimal assumptions derived mostly from the HIPPARCOS studies. Gaia resolves small details in both the kinematics of individual Sco OB2 subgroups and their distribution with distance from the Sun. We developed methods to explore the 3D kinematics of a stellar population covering large sky areas. We find nearly 11000 pre-main-sequence (PMS) members of Sco OB2 (with less than 3% field-star contamination), plus ~3600 main-sequence (MS) candidate members with a larger (10-30%) field-star contamination. A higher confidence subsample of ~9200 PMS (and ~1340 MS) members is also selected (<1% contamination for the PMS), however this group is affected by larger (~15%) incompleteness. We separately classify stars in compact and diffuse populations. Most members belong to one of several kinematically distinct diffuse populations, whose ensemble clearly outlines the shape of the entire association. Upper Sco is the densest region of Sco OB2. It is characterized by a complex spatial and kinematical structure and has no global pattern of motion. Other dense subclusters are found in Lower Centaurus-Crux and in Upper Centaurus-Lupus; the richest example of the latter, which has been recently identified, is coincident with the group near V1062 Sco. Most of the clustered stars appear to be younger than the diffuse PMS population, suggesting star formation in small groups that rapidly disperse and are diluted, reaching space densities lower than field stars while keeping memory of their original kinematics. We also find that the open cluster IC 2602 has a similar dynamics to Sco OB2, and its PMS members are currently evaporating and forming a diffuse (size~10{deg}) halo around its double-peaked core.2019A&A...623A.112Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/623/A112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/382/92 : Sco OB2 association (Shatsky+, 2002)J/A+A/464/581 : Sco OB2 intermediate-mass stars (Kouwenhoven+, 2007)J/MNRAS/416/3108 : Membership of Sco OB2 moving group (Rizzuto+, 2011)J/A+AS/126/81 : IC 2602 VRI photometry (Foster+ 1997)J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001)J/A+A/501/553 : Equivalent widths of IC2602 + IC2391 stars (D'Orazi+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/623/A112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/623/A112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/623/A112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/623/A112https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/623/A112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/623/A112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/623/A112/pms (Gaia data for PMS members of Sco OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A112/pms?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A112/pms?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A112/pms?GETtext/xml+votable180.050000true140.86254-60.644610.005555555555555556Cone search capability for table J/A+A/623/A112/list (List of fits maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A112/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A112/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A112/list?GETtext/xml+votable180.050000true219.1453468-49.44006260.005555555555555556Cone search capability for table J/A+A/623/A112/ums (Gaia data for Upper-MS members of Sco OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A112/ums?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A112/ums?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A112/ums?GETtext/xml+votable180.050000true137.45916-62.286030.0055555555555555563/665-668 670 672 675-677 688 4/2324-2325 2327 2331-2333 2384 2598 2600 2602-2603 2605 2621-2623 2650-2651 2654 2678 2684 2686-2687 2693-2698 2712-2713 2716 2720-2721 2756 2768-2769 2772 5/6144 6184 7202 7208 7211-7212 7296 7298-7299 7304 7328 7330 7338 7680 7682 9287 9293 9305-9307 9317-9319 9336 9339 9342-9343 9412 9472-9474 9477 9479-9482 9484 9488-9489 9491-9494 9497-9498 9501-9502 9505 9509 9511 9528 9540 9552 9557 9560 9566 9571 9591 10375 10377 10379-10381 10383 10386-10387 10390 10398 10404 10406 10416-10417 10419 10424 10426-10427 10429-10430 10455-10456 10459 10464 10466 10468 10470-10471 10473-10476 10479 10482 10543 10554-10555 10557-10559 10598-10599 10610-10611 10620-10621 10623 10625-10626 10629-10631 10633-10635 10637-10638 10704-10706 10709-10711 10716-10717 10740-10742 10768 10770-10771 10796 10798-10799 10856-10858 10860 10863 10868-10870 10873-10877 10888-10889 10893 10896-10897 10899 10903 10919-10920 10927 10932 10935 10937 10944 10949 10955 10960-10961 11028-11029 11031-11033 11036-11038 11040-11041 11043-11044 11049 11057-11061 11080-11081 11083-11085 11092-11094 11096-11097 11099-11101 11104 11108 11121 11125 6/24580 24582-24584 24588-24590 24592 24594 24596 24599 24601-24602 24604 24607 24609 24611-24614 24617 24620 24622 24625-24626 24629 24631 24634-24635 24643 24646 24648 24704-24705 24707-24708 24710-24711 24713-24715 24728 24740-24742 24745-24746 28813-28815 28826-28827 28836-28838 28840 28842-28843 28856-28858 29189-29191 29200 29202 29208 29210 29221-29224 29226-29229 29231 29316 29324 29326 29344 29346-29348 29356 30724 30726 30732 30752 30756 30760-30761 30763 30849 30851 30856-30857 30859 37141-37143 37171 37177-37179 37181-37183 37216-37218 37264-37265 37267 37348-37350 37352 37354 37360 37362-37366 37639 37652-37654 37696-37697 37700-37701 37901-37905 37907 37912-37913 37915 37932 37934-37935 37940-37942 37944-37946 37948-37949 37951 37960 37962-37963 37980-37981 37985-37987 37996 37998 38000-38002 38012-38013 38016 38019 38025-38027 38029-38033 38035 38040 38042-38043 38051-38054 38056 38059 38061 38064-38065 38067 38069-38072 38080-38081 38083-38084 38086-38089 38091-38094 38096 38098-38100 38105-38109 38111 38116 38118-38119 38128 38132-38133 38165-38168 38170 38172 38174-38178 38181-38185 38189 38191 38193 38195 38197 38199-38202 38204 38206 38212-38213 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42226-42227 42379 42382-42383 42456 42458-42460 42462-42463 42488-42490 42497-42499 42508-42509 42511-42513 42515 42529-42531 42544-42546 42556-42557 42559 42828-42829 42831-42834 42873-42878 42972 42974-42975 43076-43078 43188-43190 43436 43444-43446 43448-43450 43484 43487 43491 43512-43513 43515-43517 43519 43560-43561 43563-43565 43567-43568 43570-43571 43576-43577 43579-43581 43583 43592-43593 43595 43601-43604 43607-43610 43616-43617 43619 43623-43624 43626-43628 43630-43632 43634 43636 43639 43642-43643 43646-43647 43649-43654 43657-43659 43664 43666 43668-43669 43672 43674 43685 43688 43690-43693 43695-43696 43699-43700 43702-43706 43712 43714-43716 43718 43722 43724-43725 43727 43732 43735-43736 43738-43739 43744-43745 43747 43754 43756 43759-43761 43763-43766 43768 43781-43783 43787 43789-43790 43792-43793 43802-43803 43805 43808 43810-43814 43816 43818 43825 43827-43829 43831 43833-43834 43848 43852 43855-43856 43860-43861 43864 43904-43905 43907-43908 43912-43913 44120-44122 44136-44137 44139-44142 44156-44157 44159 44169-44171 44180 44184-44185 44187 44189-44190 44195 44202 44204-44205 44208 44210-44214 44216-44217 44224 44226-44227 44248-44249 44251-44253 44255-44258 44261 44329-44331 44345-44349 44351 44380 44382 44392-44394 44408-44410 44412 44414-44415 44420-44422 44425 44431 44436 44439-44441 44445 44480-44481 44483 44489 44495 44498-44499 44504-44505 44507 44509 445111.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/623/A112?format=asciiOpticaldefaultJ/A+A/623/A112/pmsGaia data for PMS members of Sco OB2Seq[1/14437] Sequential number (1)meta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDR2NameGaia DR2 Designationmeta.id;meta.mainRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.latdoublePlxAbsolute stellar parallaxmaspos.parallaxfloatpmGLONProper motion in longitude direction, pmGLON*codDE ({mu}_l_ )mas/yrpos.pm;pos.earth.lonfloatpmGLATProper motion in latitude direction ({mu}_b_)mas/yrpos.pm;pos.earth.latfloatGmagGaia DR2 G-band magnitudemagphot.mag;em.optfloatBP-RPGaia DR2 BP-RP colour indexmagphot.color;em.opt.B;em.opt.RfloatSel[pv ] Selection type (2)meta.codecharPopAssociation sub-populationmeta.id.parentcharSIMBADSimbad namemeta.idcharJ/A+A/623/A112/listList of fits mapsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitude of center (J2000)degpos.galactic.lonGLATGalactic latitude of center (J2000)degpos.galactic.latNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar_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.ranullableindexed_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.decnullableindexedJ/A+A/623/A112/umsGaia data for Upper-MS members of Sco OB2pmGLATProper motion in latitude direction ({mu}_b_)mas/yrpos.pm;pos.earth.latfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/14437] Sequential number (1)meta.recordintDR2NameGaia DR2 Designationmeta.id;meta.mainRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGLONGalactic longitude (l)degpos.galactic.lonGLATGalactic latitude (b)degpos.galactic.latdoublePlxAbsolute stellar parallaxmaspos.parallaxfloatpmGLONProper motion in longitude direction, pmGLON*codDE ({mu}_l_ )mas/yrpos.pm;pos.earth.lonfloatGmagGaia DR2 G-band magnitudemagphot.mag;em.optfloatBP-RPGaia DR2 BP-RP colour indexmagphot.color;em.opt.B;em.opt.RfloatSel[pv ] Selection type (2)meta.codecharPopAssociation sub-populationmeta.id.parentcharSIMBADSimbad namemeta.idchar