J/ApJ/658/480ivo://CDS.VizieR/J/ApJ/658/480doi:10.26093/cds/vizier.16580480CDSMakarov V.V.2017-10-11T05:12:59Z2009-06-25T21:51:27ZCDS support team

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

cds-question@unistra.frstellar-associationspre-main-sequence-starsproper-motionsinfrared-photometryvisible-astronomybroad-band-photometryKinematical analysis of spectroscopically identified pre-main-sequence stars associated with the Lupus dark cloud reveals a streamlike motion of low internal velocity dispersion (<=1.3km/s). A statistically significant mismatch between the convergent point radial velocity and the spectroscopic radial velocity from the literature indicates a moderate degree of expansion. The rate of expansion is too low to account for the present extent of the association if one assumes that the spatially dispersed population was formed in the dense molecular cores observed today. Therefore, it is unlikely that the outlying weak-lined T Tauri members were born in the same star-forming cores as the more compactly located classical T Tauri stars, despite the kinematic integrity of the association. Distances inferred from the classical moving-cluster method show a large depth of the association (~80pc) along the line of sight. A color-magnitude diagram of the association in the near-IR colors corrected for the distribution of distances shows a clear gap separating the older (5-27Myr) and the younger (~1Myr) generations of stars. Half of the identified 1Myr old stars lie in the tight group of mostly classical T Tauri stars associated with the Lupus 3 dark filament. This nest of very young stars appears to be 25pc farther from the Sun than the center of the greater Lupus association.2007ApJ...658..480Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/658/480CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/320/185 : UBVRIcJHKL photometry in Lup (Wichmann+ 1997)J/A+A/326/211 : T Tau Stars (Wichmann+, 1997)J/A+AS/123/329 : New weak-line T Tauri stars in Lupus (Krautter+ 1997)J/MNRAS/331/474 : ubvy{beta} photometry in the Lupus dark cloud (Franco, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/658/480https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/658/480http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/658/480https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/658/480https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/658/480http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/658/480GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/658/480/table2 (Kinematic T Tauri Members of the Lupus Association)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/658/480/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/658/480/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/658/480/table2?GETtext/xml+votable180.050000true226.4868881-43.20087060.0055555555555555566/41972 41973 42541 42555 42557 42559 42571 42589 42599 42609 42611 42612 42614 42615 42616 42617 42619 42628 42630 42635 42640 42653 42655 42658 42662 42663 42664 42672 42675 42678 42679 42683 42685 42689 42692 42693 42695 42696 42699 42700 42703 42704 42706 42707 42708 42712 42714 42719 42725 42727 42728 42729 42730 42735 42739 42760 42791 42885 42888 42889 42891 44050 44051 44059 44061 44063 44104 44108https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/658/480?format=asciiOpticalInfrareddefaultJ/ApJ/658/480/table2Kinematic T Tauri Members of the Lupus AssociationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharn_Name[y] Very young object (1)meta.notecharpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatDkinKinematic distancepcpos.distance;pos.heliocentricintDevRelative angular deviation, {Delta}/{sigma}{Delta}pos.angDistancefloatVtanTransverse tangential velocity componentkm/sphys.veloc.transversefloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableV-Rc? V-Rc colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-Ic? V-Ic colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableJmagJ magnitudemagphot.mag;em.IR.JfloatHmagH magnitudemagphot.mag;em.IR.HfloatKsmagKs magnitudemagphot.mag;em.IR.KfloatSimbadNameSimbad column added by the CDSmeta.idcharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main