J/ApJ/904/196ivo://CDS.VizieR/J/ApJ/904/196doi:10.26093/cds/vizier.19040196CDSTian H.-J.2023-08-16T14:04:34Z2022-04-07T09:31:55ZCDS support team

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

cds-question@unistra.fropen-star-clustersob-starsyoung-stellar-objectspre-main-sequence-starsvisible-astronomynarrow-band-photometryradial-velocityproper-motionsWe report the discovery of a young (only 30-40Myr) snake-like structure (dubbed a stellar snake) in the solar neighborhood from Gaia DR2. The average distance of this structure is about 310pc from us. Both the length and width are over 200pc, but the thickness is only about 80pc. The snake has one tail and two dissolving cores, which can be clearly distinguished in the 6D phase space. The whole structure includes thousands of members with a total mass of larger than 2000M{sun} in a uniform population. The population is so young that it cannot be well explained with the classical theory of tidal tails. We therefore suspect that the snake is hierarchically primordial, rather than the result of dynamically tidal stripping, even if the snake is probably expanding. The coherent 5D phase information and the ages suggest that the snake was probably born in the same environment as the filamentary structure of Beccari et al. If so, the snake could extend the sky region of the Vela OB2 association by a factor of ~2 and supplement the census of its coeval structures. This finding is useful to understanding the history of the formation and evolution of the Vela OB2 complex. The age of the snake well matches with that of the Gould Belt. In the sky region of our interest, we detect one new open cluster, which is named Tian 1 in this work.2020ApJ...904..196Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/904/196CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/MNRAS/358/13 : Faint dwarfs in NGC 2547 (Jeffries+, 2005)J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)J/MNRAS/393/538 : Stellar association around gamma Vel (Jeffries+, 2009)J/A+A/495/807 : Shape parameters for 650 open clusters (Kharchenko+, 2009)J/A+A/558/A53 : Milky Way global survey star clusters. II. (Kharchenko+, 2013)J/A+A/563/A94 : Kinematics of the Gamma Vel cluster (Jeffries+, 2014)J/A+A/561/A142 : Galactic extinction from SDSS BHB stars (Tian+, 2014)J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)J/A+A/626/A17 : Young population in Vela-Puppis region (Cantat-Gaudin+, 2019)J/A+A/621/A115 : Vela OB2 members (Cantat-Gaudin+, 2019)J/A+A/631/A166 : Members of 5 cluster in Ori OB1a association (Kos+, 2019)J/AJ/158/122 : Local structure & star formation history of MW (Kounkel+, 2019)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019)J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)J/A+A/633/A99 : Gaia DR2 open clusters in Milky Way. II (Cantat-Gaudin+, 2020)J/AJ/159/105 : 2 new stellar associations in vicinity of the Sun (Liu+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/904/196https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/904/196http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/904/196https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/904/196https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/904/196http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/904/196GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/904/196/table1 (Stellar parameters of candidate members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/904/196/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/904/196/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/904/196/table1?GETtext/xml+votable180.050000true96.81529499-9.803598720.0055555555555555564/1376-1378 1384 1473 1475 5/5334-5335 5340-5341 5343 5419 5422-5423 5516 5518 5542 5544-5545 5547-5548 5550 5924-5925 5927 5933 5935 5946 6021 6023 6029 6031-6032 6034 6040 6042 6053 6066 6072 6/20991 21330-21331 21333-21335 21460-21461 21463 21469 21493 21666-21667 21671 21673 21675 21680 21686-21687 22068-22070 22076-22078 22080 22082 22090 22160 22162-22163 22185 22198 22204-22206 23553 23555 23557 23559 23565 23589 23591 23595-23596 23598 23618 23626 23648 23650 23687 23692-23694 23704-23705 23707 23716 23718-23719 23728-23729 23731 23736-23737 23739 23746 23750 23752 23754 23776 23778-23779 23782 23790 24081 24083 24089 24091 24113 24115 24134 24142 24164 24167 24172 24174 24221-24223 24245-24246 24256-24257 24259 24262-24263 24269-24270 24275 24280 24294 24296-24297 24299-243001.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/904/196?format=asciiOpticaldefaultJ/ApJ/904/196/table1Stellar parameters of candidate membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR2 identifiermeta.id;meta.mainGLON[177/223] Galactic longitude, Gaia DR2, (J2015.5)degpos.galactic.lonGLAT[-13.5/1.84] Galactic latitude, Gaia DR2, (J2015.5)degpos.galactic.latpmGLON[-4.29/0.69] Proper motion in GLONmas/yrpos.pmfloate_pmGLON[0.03/0.8] Uncertainty in pmGLONmas/yrstat.errorfloatpmGLAT[-4.42/1.27] Proper motion in GLATmas/yrpos.pmfloate_pmGLAT[0.03/0.7] Uncertainty in pmGLATmas/yrstat.errorfloatDist[200/409] Gaia DR2 distance, 1000/plxpcpos.distancefloate_Dist[0.9/38] Uncertainty in Distpcstat.errorfloatRVel[-40.4/99.3]? Radial Velocity from Gaia, LAMOST, APOGEEkm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[0.02/23]? Uncertainty in RVkm/sstat.error;spect.dopplerVelocfloatnullableFe/H[-0.51/0.23]? Metallicity from LAMOST & APOGEEphys.abund.Zdoublenullablee_Fe/H[0.01/0.3]? Uncertainty in Fe/Hstat.error;phys.abund.Fedoublenullablelogg[3.9/4.72]? log Surface gravity from LAMOST, APOGEElog(cm.s**-2)phys.gravityfloatnullablee_logg[0.01/0.5]? Uncertainty in logglog(cm.s**-2)stat.errorfloatnullableGmag[0.99/11.9] Gaia Gmagmagphot.mag;em.opt.VfloatBR-BP[-0.05/3.5] Gaia BR-BP colormagphot.color;em.opt.B;em.opt.RfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000. (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.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000. (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.decindexed