J/MNRAS/515/687ivo://CDS.VizieR/J/MNRAS/515/687doi:10.26093/cds/vizier.75150687CDSQuintana A.L.Wright N.J.2024-08-22T20:16:14Z2022-08-17T06:54:43ZCDS support team

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

cds-question@unistra.frstellar-associationsob-starsvisible-astronomytrigonometric-parallaxproper-motionsstellar-agesstellar-distanceThe proper motions (PMs) of OB stars in Cygnus have recently been found to exhibit two large-scale kinematic patterns suggestive of expansion. We perform a 3D traceback on these OB stars, the newly identified OB associations and related open clusters in the region. We find that there are two groups of stars, associations and clusters and that they were each more compact in the past, reaching their closest approach 7.9^+3.0^_-1.8_ and 8.5^+0.8^_-2.8_Myr ago. We consider two main scenarios for the driver of these large-scale expansion patterns: feedback-driven expansion from a previous generation of massive stars, and expansion as a result of the turbulent velocity field in the primordial molecular cloud. While it is tempting to attribute such large-scale expansion patterns to feedback processes, we find that the observed kinematics are fully consistent with the turbulent origin, and therefore that the injection of further energy or momentum from feedback is not required. Similar conclusions may be drawn for other star forming regions with large-scale expansion patterns.2022MNRAS.515..687Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/515/687CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/ApJ/811/85 : RVs + V-band LCs of probable members of Cyg OB2 (Kiminki+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/515/687https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/515/687http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/515/687https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/515/687https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/515/687http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/515/687GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/515/687/asscyg2 (Position, proper motions and SED-fitted distance of the association members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/515/687/asscyg2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/515/687/asscyg2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/515/687/asscyg2?GETtext/xml+votable180.050000true305.9359469437.2578250.0055555555555555565/3657 3660 6/14622 14627 14633 14636-14637 14644-14646 14653 14655 14670-14671 14689 14691-14694 14696 14698-14699 14741 14784-14785https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/515/687?format=asciiOpticaldefaultJ/MNRAS/515/687/asscyg2Position, proper motions and SED-fitted distance of the association membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Gaia EDR3 source identification number (GaiaEDR3)meta.id;meta.mainRA_ICRSBarycentric right ascension (ICRS) at Ep=2016.0 of the source (ICRS) at Ep=2016.0 (RA_ICRS)degpos.eq.ra;meta.mainDE_ICRSBarycentric right ascension (ICRS) at Ep=2016.0 of the source (ICRS) at Ep=2016.0 (DE_ICRS)degpos.eq.dec;meta.mainpmGLONProper motion in Galactic longitude direction at Ep=2016.0 (pml)mas/yrpos.pm;pos.galactic.lonfloate_pmGLONStandard error of proper motion in Galactic longitude direction (e_pml)mas/yrstat.errorfloatpmGLATProper motion in Galactic latitude direction at Ep=2016.0 (pmb)mas/yrpos.pm;pos.galactic.latfloate_pmGLATStandard error of proper motion in Galactic latitude direction (e_pmb)mas/yrstat.errorfloatDistMedian SED-fitted distance (Dist)pcpos.distanceintb_Dist16th percentile SED-fitted distance from the posterior distribution (b_Dist)pcpos.distanceintB_Dist84th percentile SED-fitted distance from the posterior distribution (B_Dist)pcpos.distanceint_RA.icrsRight ascension (ICRS) at Epoch=J2016. (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=J2016. (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.decnullableindexedAssoc[ABCDEF] Association designation (Association)meta.id.parentchar