J/A+A/630/A137ivo://CDS.VizieR/J/A+A/630/A137doi:10.26093/cds/vizier.36300137CDSGalli P.A.B.Loinard L.Bouy H.Sarro L.M.Ortiz-Leon G.N.,Dzib S.A.Olivares J.Heyer M.Hernandez J.Roman-Zuniga C.,Kounkel M.Covey K.2021-01-19T11:54:40Z2019-10-07T08:30:30ZCDS support team

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

cds-question@unistra.frstellar-associationsopen-star-clustersstellar-distanceWe take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the nearby Taurus star-forming region. We apply a hierarchical clustering algorithm for partitioning the stars in our sample into groups (i.e., clusters) that are associated with the various molecular clouds of the complex, and derive the distance and spatial velocity of individual stars and their corresponding molecular clouds. We show that the molecular clouds are located at different distances and confirm the existence of important depth effects in this region reported in previous studies. For example, we find that the L~1495 molecular cloud is located at d=129.9^+0.4^_-0.3_pc, while the filamentary structure connected to it (in the plane of the sky) is at d=160.0^+1.2^_-1.2_pc. We report B215 and L1558 as the closest (d=128.5^+1.6^_-1.6_pc) and most remote (d=198.1^+2.5^_-2.5_pc) substructures of the complex, respectively. The median inter-cloud distance is 25pc and the relative motion of the subgroups is on the order of a few km/s. We find no clear evidence for expansion (or contraction) of the Taurus complex, but signs of the potential effects of a global rotation. Finally, we compare the radial velocity of the stars with the velocity of the underlying ^13^CO molecular gas and report a mean difference of 0.04+/-0.12km/s (with r.m.s. of 0.63km/s) confirming that the stars and the gas are tightly coupled.2019A&A...630A.137Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A137CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/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/630/A137https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/630/A137http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/630/A137https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/630/A137https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/630/A137http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/630/A137GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/630/A137/tablea1 (Proper motions, parallaxes, radial velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/630/A137/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/630/A137/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/630/A137/tablea1?GETtext/xml+votable180.050000true60.955526.18111110.0055555555555555565/262 268-270 278 289 292 6/325 336-337 342-343 350 377 1027 1029-1031 1033 1036-1037 1039-1040 1042-1043 1046-1047 1052-1054 1061-1063 1066 1068-1069 1084 1086 1098 1102 1104 1106 1108 1111 1119 1121 1123-1126 1133 1136 1152 1154 1161 1164 1167 1174 1176 1180 23517-23518 23527 23533 23542-23543 23548-23549 23551 24194-24195 24201-24203 24221 24224-24225 24227 24232-24233 24245 24270 24289 24294-24295 24297 24300https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/630/A137?format=asciidefaultJ/A+A/630/A137/tablea1Proper motions, parallaxes, radial velocitiesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASSSource identifier from 2MASS cataloguemeta.id;meta.maincharGaiaDR2Source identifier from Gaia-DR2 cataloguemeta.idcharprimaryNameOther source identifiermeta.idcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainpmRA? Proper motion in right ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Error in proper motion in right ascensionmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Error in proper motion in declinationmas/yrstat.error;pos.pm;pos.eq.decfloatnullableplx? Parallaxmaspos.parallax.trigfloatnullablee_plx? Error in parallaxmasstat.error;pos.parallaxfloatnullabler-astroSource of astrometric data (GaiaDR2 or VLBI)meta.bibcharrv? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_rv? Error in radial velocitykm/sstat.errorfloatnullabler_rvSource of radial velocity (1)meta.ref;pos.framecharClusterHMAC clustermeta.id.assoccharMember[0/1] Membership statusmeta.code.memberintJ17[0/1] Membership status by Joncour et al. 2017, Cat. J/A+A/599/A14meta.code.memberintL18-t1[0/1] Membership status by Luhman 2018, Cat. J/AJ/156/271 (table 1)meta.code.memberintL18-t6[0/1] Membership status by Luhman 2018, Cat. J/AJ/156/271 (table 6)meta.code.memberintDistindicates distance and spatial velocity data in tablea3meta.ref.urlcharJ/A+A/630/A137/tablea3Distance and spatial velocityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASSSource identifier from 2MASS cataloguemeta.id;meta.maincharGaiaDR2Source identifier from Gaia-DR2 cataloguemeta.idcharNameOther source identifiermeta.idchardist-invDistance from the inverse of the parallaxpcpos.distance;pos.heliocentricfloate_dist-invLower uncertainty for the distancepcstat.errorfloatE_dist-invUpper uncertainty for the distancepcstat.error;stat.maxfloatdistDistance from Bayesian inferencepcpos.distance;pos.heliocentricfloate_distLower uncertainty for the distancepcstat.errorfloatE_distUpper uncertainty for the distancepcstat.error;stat.maxfloatXgalX-coordinatepcpos.cartesian.x;pos.galacticfloate_XgalLower uncertainty of Xpcstat.errorfloatE_XgalUpper uncertainty of Xpcstat.error;stat.maxfloatYgalY-coordinatepcpos.cartesian.y;pos.galacticfloate_YgalLower uncertainty of Ypcstat.errorfloatE_YgalUpper uncertainty of Ypcstat.error;stat.maxfloatZgalZ-coordinatepcpos.cartesian.z;pos.galacticfloate_ZgalLower uncertainty of Zpcstat.error;pos.distance;pos.cartesian.zfloatE_ZgalUpper uncertainty of Zpcstat.error;stat.maxfloatUgal? U-component of the velocitykm/sphys.veloc;pos.cartesian.xfloatnullablee_Ugal? Lower uncertainty of Ukm/sstat.errorfloatnullableE_Ugal? Upper uncertainty of Ukm/sstat.error;stat.maxfloatnullableVgal? V-component of the velocitykm/sphys.veloc;pos.cartesian.yfloatnullablee_Vgal? Lower uncertainty of Vkm/sstat.errorfloatnullableE_Vgal? Upper uncertainty of Vkm/sstat.error;stat.maxfloatnullableWgal? W-component of the velocitykm/sphys.veloc;pos.cartesian.zfloatnullablee_Wgal? Lower uncertainty of Wkm/sstat.errorfloatnullableE_Wgal? Upper uncertainty of Wkm/sstat.error;stat.maxfloatnullableuLSR? u-component of the LSR velocitykm/sphys.veloc;pos.lsrfloatnullablee_uLSR? Lower uncertainty of ukm/sstat.errorfloatnullableE_uLSR? Upper uncertainty of ukm/sstat.error;stat.maxfloatnullablevLSR? v-component of the LSR velocitykm/sphys.veloc;pos.lsrfloatnullablee_vLSR? Lower uncertainty of vkm/sstat.error;phys.veloc;pos.lsrfloatnullableE_vLSR? Upper uncertainty of vkm/sstat.error;stat.maxfloatnullablewLSR? w-component of the LSR velocitykm/sphys.veloc;pos.lsrfloatnullablee_wLSR? Lower uncertainty of wkm/sstat.errorfloatnullableE_wLSR? Upper uncertainty of wkm/sstat.error;stat.maxfloatnullablervLSR? Radial velocity converted to LSRkm/sspect.dopplerVeloc;pos.lsrfloatnullablee_rvLSR? Uncertainty of rvLSRkm/sstat.error;spect.dopplerVeloc;pos.lsrfloatnullable