J/ApJ/838/44ivo://CDS.VizieR/J/ApJ/838/44doi:10.26093/cds/vizier.18380044CDSHansen T.T.Simon J.D.Marshall J.L.Li T.S.Carollo D.Depoy D.L.,Nagasawa D.Q.Bernstein R.A.Drlica-Wagner A.Abdalla F.B.Allam S.,Annis J.Bechtol K.Benoit-Levy A.Brooks D.Buckley-Geer E.,Carnero Rosell A.Carrasco Kind M.Carretero J.Cunha C.E.,da Costa L.N.Desai S.Eifler T.F.Fausti Neto A.Flaugher B.,Frieman J.Garcia-Bellido J.Gaztanaga E.Gerdes D.W.Gruen D.,Gruendl R.A.Gschwend J.Gutierrez G.James D.J.Krause E.Kuehn K.,Kuropatkin N.Lahav O.Miquel R.Plazas A.A.Romer A.K.Sanchez E.,Santiago B.Scarpine V.Smith R.C.Soares-Santos M.Sobreira F.,Suchyta E.Swanson M.E.C.Tarle G.Walker A.R.(the DES Collaboration)2018-03-12T08:28:26Z2017-11-27T15:08:40ZCDS support team

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

cds-question@unistra.frchemical-abundancesline-intensitiespeculiar-variable-starsChemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate TucanaIII. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DESJ235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.2017ApJ...838...44Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/838/44CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/612/447 : Draco 119 and HD 88609 equivalent widths (Fulbright+, 2004)J/ApJ/617/1091 : La and Eu abundances in 85 stars (Simmerer+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/ApJ/701/1053 : Abundances of 8 stars in the Draco dSph (Cohen+, 2009)J/ApJ/719/931 : Chemical evolution of the UMi dSph (Cohen+, 2010)J/A+A/523/A17 : Individual stars in Fornax dSph center (Letarte+, 2010)J/ApJ/742/37 : Abundances of six RGB stars in M22 (Roederer+, 2011)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/AJ/144/168 : Spectroscopy of Scl 1019417 and UMi 20103 (Kirby+, 2012)J/ApJ/751/102 : Equivalent widths of 9 RGB in Carina dSph (Venn+, 2012)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/775/L27 : Chemical abundances in a metal-poor RGB star (Johnson+, 2013)J/ApJ/778/149 : Abundances for 3 stars in Sgr dSph (McWilliam+, 2013)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/572/A88 : Measured EWs for Fornax RGB stars (Lemasle+, 2014)J/A+A/571/A47 : Linelist of CH in stellar atmospheres (Masseron+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/802/93 : Abundance analysis of 5 stars in Sculptor (Simon+, 2015)J/A+A/574/A129 : The First CEMP star in the Sculptor dSph (Skuladottir+, 2015)J/ApJ/830/93 : Ret II brightest red giant member abundances (Ji+, 2016)J/ApJ/838/11 : Member stars in the MW satellite Tucana III (Simon+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/838/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/838/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/838/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/838/44https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/838/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/838/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/838/44/table1Fe I and Fe II lines used for parameter determinationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpeciesSpeciesmeta.notecharlambda[3743.3/6750.2] Species wavelength, Angstroms0.1nmem.wlfloatExPot[0/4.5] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-5/0.6] Log of the oscillator strengthphys.atmol.oscStrengthfloatEW[10/215.5] Equivalent Width, Species, milli-Angstroms1e-13mspect.line.eqWidthfloatlogeps[4.7/5.7] Log {epsilon} abundancephys.abundfloatJ/ApJ/838/44/table2Atomic line datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpeciesSpeciesmeta.notecharlambda[3768.4/7699] Species wavelength, Angstroms0.1nmem.wlfloatExPot[0/4.4] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-9.8/0.6] Log of the oscillator strengthphys.atmol.oscStrengthfloat