J/MNRAS/453/2220ivo://CDS.VizieR/J/MNRAS/453/2220doi:10.26093/cds/vizier.74532220CDSMurphy S.J.Lawson W.A.Bento J.2024-08-15T20:15:15Z2016-05-24T10:49:12ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsradial-velocityproper-motionsvisible-astronomytrigonometric-parallaxWe report the serendipitous discovery of several young mid-M stars found during a search for new members of the 30-40Myr-old Octans Association. Only one of the stars may be considered a possible Octans(-Near) member. However, two stars have proper motions, kinematic distances, radial velocities, photometry and LII {lambda}6708 measurements consistent with membership in the 8-10Myr-old TW Hydrae Association. Another may be an outlying member of TW Hydrae but has a velocity similar to that predicted by membership in Octans. We also identify two new lithium-rich members of the neighbouring Scorpius-Centaurus OB Association (Sco-Cen). Both exhibit large 12 and 22{mu}m excesses and strong, variable H{alpha} emission which we attribute to accretion from circumstellar discs. Such stars are thought to be incredibly rare at the ~16Myr median age of Sco-Cen and they join only one other confirmed M-type and three higher mass accretors outside of Upper Scorpius. The serendipitous discovery of two accreting stars hosting large quantities of circumstellar material may be indicative of a sizeable age spread in Sco-Cen, or further evidence that disc dispersal and planet formation time-scales are longer around lower mass stars. To aid future studies of Sco-Cen, we also provide a newly compiled catalogue of 305 early-type Hipparcos members with spectroscopic radial velocities sourced from the literature.2015MNRAS.453.2220Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/453/2220CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/320 : SPM 4.0 Catalog (Girard+, 2011)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov 2006)III/254 : 2nd Cat. of RV with Astrometric Data (Kharchenko+, 2007)J/ApJ/738/122 : ScoCen debris disks Around F- and G-type stars (Chen+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/453/2220https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/453/2220http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/453/2220https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/453/2220https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/453/2220http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/453/2220GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/453/2220/tablea1 (*Early-type Sco-Cen members with literature RVs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/453/2220/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/453/2220/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/453/2220/tablea1?GETtext/xml+votable180.050000true153.37763611-66.372811110.0055555555555555566/29348 30722 37149 37187 37197 37268 37270 37314 37888 37900 37905 37928 37953 37968 37972-37974 37990 41534 41568 41606-41607 41632-41634 41637 41641 41643 41646 41652 41657 41661 41677 41704-41705 41707 41710 41726 41866 41869 41897 41900 41906 41915 41917 41937 41946-41947 41963 41971 41973 41983 42173-42174 42218 42237 42406-42407 42414 42419 42424 42428 42465-42466 42521 42548 42559 42563 42571 42585 42600 42613 42617-42618 42622-42623 42633 42640 42645 42651-42653 42656 42658 42670 42672 42674 42677-42678 42684 42687-42688 42694 42707 42711 42715 42725 42727-42728 42736 42738-42739 42742 42746 42749 42757 42763 42789 42808 42857 42876 42885-42886 42903 42916-42917 42924 42932 42941 42948 42953 42956 42960 42964 42977 42984-42985 42987 42989 42994 43011-43012 43017 43019 43021 43029 43037-43038 43054-43055 43059 43062 43067 43072-43073 43086 43093-43094 43115 43117 43127 43133 43136-43137 43140 43147 43149-43150 43153 43157 43161 43165-43166 43168-43169 43182-43183 43189 43192 43194 43196-43197 43201-43202 43205-43206 43208 43210-43211 43224-43225 43229 43232 43238 43244 43246 43259 43272 43274 43285 43287 43298 43301 43326 43332-43333 43337-43338 43345 43349 43352 43355 43358 43360 43372 43375 43377-43378 43383 43397 43407 43414 43416 43429 43442 43460 43492 43522 43527 43529-43531 43538 43541 43557 43564 44036 44043-44044 44052 44054 44078 44081 44101 44106 44114 44119 44132 44136 44156 44162 44293 44305-44307 44310 44312-44313 44316 44319 44321 44352 44354 44358-44361 44363 44366 44368 44371 44378 44385 44389 44393 44436 44502https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/453/2220?format=asciiOpticaldefaultJ/MNRAS/453/2220/tablea1*Early-type Sco-Cen members with literature RVsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIP[50083/83693] HIP numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoublePlxTrigonometric parallaxmaspos.parallax.trigfloate_Plxrms uncertainty on Plxmasstat.error;pos.parallaxfloatpmRAProper motion mu_alpha.cos(delta)mas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion mu_deltamas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatpmGLONProper motion in Galactic Longitudepos.pm;pos.galactic.lonfloatpmGLATProper motion in Galactic Latitudepos.pm;pos.galactic.latfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVrms uncertainty on RVkm/sstat.errorfloatr_RVReference for RV (1)meta.ref;pos.framecharXHeliocentric X position (+ towards GC)pos.cartesian.x;pos.heliocentricfloatYHeliocentric Y positionpos.cartesian.y;pos.heliocentricfloatZHeliocentric Z positionpos.cartesian.z;pos.heliocentricfloatUvelHeliocentric U velocity componentkm/spos.cartesian.xfloate_Uvelrms uncertainty on UVelkm/sstat.errorfloatVvelHeliocentric V velocity componentkm/spos.cartesian.yfloate_Vvelrms uncertainty on VVelkm/sstat.errorfloatWvelHeliocentric W velocity componentkm/spos.cartesian.zfloate_Wvelrms uncertainty on WVelkm/sstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar