J/MNRAS/448/2737ivo://CDS.VizieR/J/MNRAS/448/2737doi:10.26093/cds/vizier.74482737CDSRizzuto A.C.Ireland M.J.Kraus A.L.2024-08-14T20:20:20Z2015-05-05T08:03:13ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsline-intensitiesmorgan-keenan-classificationWe present 237 new spectroscopically confirmed pre-main-sequence K- and M-type stars in the young Upper Scorpius subgroup of the Sco-Cen association, the nearest region of recent massive star formation. Using the Wide-Field Spectrograph at the Australian National University 2.3 m telescope at Siding Spring, we observed 397 kinematically and photometrically selected candidate members of Upper Scorpius, and identified new members by the presence of lithium absorption. The HR-diagram of the new members shows a spread of ages, ranging from ~3 to 20Myr, which broadly agrees with the current age estimates of ~5-10Myr. We find a significant range of Li 6708 equivalent widths among the members, and a minor dependence of HR-diagram position on the measured equivalent width of the Li 6708{AA} line, with members that appear younger having more lithium. This could indicate the presence of either populations of different age, or a spread of ages in Upper Scorpius. We also use Wide-Field Infrared Survey Explorer data to infer circumstellar disc presence in 25 of the members on the basis of infrared excesses, including two candidate transition discs. We find that 11.2+/-3.4% the M0-M2 spectral type (0.4-0.8M_{sun}_) Upper Sco stars display an excess that indicates the presence of a gaseous disc.2015MNRAS.448.2737Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/2737CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/2737https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/2737http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/2737https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/2737https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/2737http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/2737GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/2737/table1 (Summary of all candidates observed (397 candidates; duplicates have been removed))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2737/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2737/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2737/table1?GETtext/xml+votable180.050000true234.779-26.77558330.005555555555555556Cone search capability for table J/MNRAS/448/2737/table2 (New pre-Main Sequence (PMS) stars in Upper Sco)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2737/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2737/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2737/table2?GETtext/xml+votable180.050000true234.779-26.77558330.005555555555555556Cone search capability for table J/MNRAS/448/2737/table3 (List of members with circumstellar disk)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2737/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2737/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2737/table3?GETtext/xml+votable180.050000true239.5529167-23.47677780.0055555555555555565/10727 10733-10735 10738 10745-10747 10750 11076-11077 11079 11089-11094 11096 6/29352 29354 29360 30721 30723-30724 30728 30732-30733 30738 30744 30758 42798 42859 42861-42863 42903 42906-42907 42924 42929 42931 42945-42948 42950-42951 42956 42958-42959 42964-42965 42977-42979 42992 42994 42996 42998 43007 44289 44299 44301 44303 44321 44324 44332 44338 44340-44341 44344 44353-44355 44380 44388 44390-44391 44400 44402-44403 44405 44407 44433 44436 44481 44483 444878.157980699529898e-21 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/2737?format=asciiOpticaldefaultJ/MNRAS/448/2737/table1Summary of all candidates observed (397 candidates; duplicates have been removed)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag[8.6/20] Visual Magnitudemagphot.mag;em.opt.VfloatKmag[6.1/12] 2MASS Ks magnitudemagphot.mag;em.IR.KfloatpmRAProper Motion in RA*cosDEmas/yrpos.pm;pos.eq.rafloatpmDEProper Motion in DEmas/yrpos.pm;pos.eq.decfloatr_pmDE[a/b] Source of proper motion (1)meta.ref;pos.pm;pos.eq.deccharpMmb[0/99]? Probability of Membership%statintnullablesMmb[Y] Spectroscopic Membermeta.code.membercharDSimbad column added by the CDSmeta.ref.urlintnullable2MDisplay the 2MASS data (Cutrie et al. 2003, II/246)meta.ref.urlcharJ/MNRAS/448/2737/table2New pre-Main Sequence (PMS) stars in Upper ScoSpTSpectral Typesrc.spTypecharAV[0/2.8] Visual Extinctionphys.absorption;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRIKUSco Member Name (RIK-NNN)meta.id;meta.mainint2MASS2MASS designation (JHHMMSSss+DDMMSSs)meta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainEWLi[0.09/1.07] Li(6708{AA}) equivalent width ({AA})0.1nmspect.line.eqWidthfloate_EWLi[0.01/0.25] Uncertainty in EWLi0.1nmstat.errorfloatEWHa[-130/4.2] H-{alpha} Equivalent Width0.1nmspect.line.eqWidthfloate_EWHa[0.01/14] Uncertainty in EWHa0.1nmstat.errorfloatDSimbad column added by the CDSmeta.ref.urlintnullable2MDisplay the 2MASS data (Cutrie et al. 2003, II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/448/2737/table3List of members with circumstellar diskrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS designationmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainsMmb[Y? ] Spectroscopic Membermeta.code.membercharExc[EX] Excess (E) in the WISE 2,3,4 bands (1)meta.codecharDiskDisk Type (2)src.classcharW2magWISE W2 (4.6um) magnitudemagphot.mag;em.IR.4-8umfloatW3magWISE W3 (11.6um) magnitudemagphot.flux.density;em.IR.8-15umfloatW4magWISE W4 (22.1um) magnitudemagphot.flux.density;em.IR.15-30umfloat