J/ApJ/711/573ivo://CDS.VizieR/J/ApJ/711/573doi:10.26093/cds/vizier.17110573CDSRoederer I.U.Sneden C.Thompson I.B.Preston G.W.Shectman S.A.2017-07-05T06:59:26Z2012-04-23T13:57:43ZCDS support team

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

cds-question@unistra.frline-intensitieschemical-abundancesradial-velocityhalo-starsgiant-starsmilky-way-galaxyWe present the results of a detailed abundance analysis of one of the confirmed building blocks of the Milky Way stellar halo, a kinematically coherent metal-poor stellar stream. We have obtained high-resolution and high signal-to-noise spectra of 12 probable stream members using the Magellan Inamori Kyocera Echelle spectrograph on the Magellan-Clay Telescope at Las Campanas Observatory and the 2dCoude spectrograph on the Smith Telescope at McDonald Observatory. We have derived abundances or upper limits for 51 species of 46 elements in each of these stars. The stream members show a range of metallicity (-3.4<[Fe/H]<-1.5) but are otherwise chemically homogeneous, with the same star-to-star dispersion in [X/Fe] as the rest of the halo. This implies that, in principle, a significant fraction of the Milky Way stellar halo could have formed from accreted systems like the stream. The stream stars show minimal evolution in the {alpha} or Fe-group elements over the range of metallicity. This stream is enriched with material produced by the main and weak components of the rapid neutron-capture process and shows no evidence for enrichment by the slow neutron-capture process.2010ApJ...711..573Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/711/573CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/534/A136 : Halo red giants from the SEGUE survey (Martell+, 2011)J/ApJ/706/1095 : Chemical compositions of 26 outer halo stars (Zhang+, 2009)J/A+A/442/961 : Lithium content of the Galactic Halo stars (Charbonnel+, 2005)J/A+A/415/993 : FeII, ZNI and SI abundances on halo stars (Nissen+, 2004)J/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004)J/AJ/125/2502 : Spectral indices of Galactic halo (Morrison+, 2003)J/AJ/126/1362 : Century Survey Galactic Halo Project. I. (Brown+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/711/573https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/711/573http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/711/573https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/711/573https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/711/573http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/711/573GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/711/573/stars (Candidate stream members: observational data and model atmosphere parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/711/573/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/711/573/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/711/573/stars?GETtext/xml+votable180.050000true194.83304839.24323280.0055555555555555566/7456 9065 10404 16115 16433 26534 26589 35875 44208 46446 46532 46699https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/711/573?format=asciiOpticaldefaultJ/ApJ/711/573/starsCandidate stream members: observational data and model atmosphere parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryRAJ2000Hour of right ascension (J2000)pos.eq.raDEJ2000Degree of declination (J2000)pos.eq.decHRV? Mean or systemic heliocentric radial velocitykm/sspect.dopplerVeloc;stat.meanfloatnullableFlag[0/3] Binarity flag (1)meta.code.errorintExpTotal exposure timestime.duration;obs.exposureintNobsNumber of observation(s)meta.numberintS/N33950{AA} S/Nstat.snrintS/N44550{AA} S/Nstat.snrintS/N55200{AA} S/Nstat.snrintS/N66750{AA} S/Nstat.snrintSimbadSimbad column added by the CDSmeta.refcharTeffModel effective temperatureKphys.temperature.effective;meta.modelledintloggModel surface gravitylog(cm.s**-2)phys.gravity;meta.modelledfloatVtModel microturbulent velocitykm/sphys.veloc;stat.param;meta.modelledfloat[M/H]Model metallicity abundancelog(Sun)phys.abund.Z;meta.modelledfloatStateModel evolutionary state: RGB = red giant branch, RHB = red horizontal branch, SGB = subgiant branch.meta.code.classchar_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.mainJ/ApJ/711/573/table4Equivalent width measurements for all starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharLambdaWavelength in Angstroms0.1nmem.wlfloatIonSpecies identification (1)phys.atmol.ionStagefloatExPotExcitation potentialeVphys.atmol.excitationfloatlog(gf)Log of the oscillator strengthphys.atmol.oscStrengthfloatEW? Equivalent width (m{AA})0.1pmspect.line.eqWidthfloatnullablef_EW[ls] Flag on EW (2)meta.codecharJ/ApJ/711/573/table1Log of observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharTelTelescope/Instrumentmeta.notecharExpExposure timestime.duration;obs.exposureintObsDate of observationstime.epochnullableHJDHeliocentric Julian Datedtime.epochdoubleHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloat