J/ApJ/915/103ivo://CDS.VizieR/J/ApJ/915/103doi:10.26093/cds/vizier.19150103CDSHansen T.T.Ji A.P.Da Costa G.S.Li T.S.Casey A.R.Pace A.B.,Cullinane L.R.Erkal D.Koposov S.E.Kuehn K.Lewis G.F.Mackey D.,Simpson J.D.Shipp N.Zucker D.B.Bland-Hawthorn J.S5 Collaboration2023-01-24T14:11:01Z2023-01-18T12:06:28ZCDS support team

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

cds-question@unistra.frchemical-abundancesatomic-physicsastronomical-reference-materialsstellar-associationsvisible-astronomyspectroscopyThe recently discovered Indus stellar stream exhibits a diverse chemical signature compared to what is found for most other streams due to the abundances of two outlier stars, Indus_0 and Indus_13. Indus_13 exhibits an extreme enhancement in rapid neutron-capture (r-)process elements with [Eu/Fe]=+1.81. It thus provides direct evidence of the accreted nature of r-process-enhanced stars. In this paper we present a detailed chemical analysis of the neutron-capture elements in Indus_13, revealing the star to be slightly actinide poor. The other outlier, Indus_0, displays a globular cluster-like signature with high N, Na, and Al abundances, while the rest of the Indus stars show abundances compatible with a dwarf galaxy origin. Hence, Indus_0 provides the first chemical evidence of a fully disrupted dwarf containing a globular cluster. We use the chemical signature of the Indus stars to discuss the nature of the stream progenitor which was likely a chemically evolved system, with a mass somewhere in the range from Ursa Minor to Fornax.2021ApJ...915..103Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/915/103CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/AJ/118/1671 : Fornax cluster 4 VI photometry (Buonanno+, 1999)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJS/167/292 : Laboratory transitions for Gd II (Den Hartog+, 2006)J/ApJ/645/613 : Abundances of HD 221170 (Ivans+, 2006)J/ApJS/162/227 : Transition probabilities for SmII (Lawler+, 2006)J/ApJS/169/120 : Transition probabilities for HfII and Hf (Lawler+, 2007)J/ApJ/701/1053 : Abundances of 8 stars in the Draco dSph (Cohen+, 2009)J/ApJS/182/51 : Transitions of rare earth elements (Lawler+, 2009)J/ApJS/182/80 : Rare earth abundances (Sneden+, 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/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/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/ApJ/751/102 : Equivalent widths of 9 RGB in Carina dSph (Venn+, 2012)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/ApJ/797/15 : HST/WFC3 obs. in 4 metal-poor GCs of Fornax (Larsen+, 2014)J/A+A/572/A88 : Measured EWs for Fornax RGB stars (Lemasle+, 2014)J/A+A/569/A43 : HE 2252-4225 abundance analysis (Mashonkina+, 2014)J/A+A/571/A47 : Extensive linelist of CH in stellar atm. (Masseron+, 2014)J/A+A/581/A70 : Grid of NLTE EW & NLTE corr. BaII lines (Korotin+, 2015)J/AJ/151/82 : 4 brightest red giants in Ret 2 (Roederer+, 2016)J/ApJ/838/44 : Abund. of the brightest member of Tuc III (Hansen+, 2017)J/A+A/607/A91 : CS 29497-004 abundances (Hill+, 2017)J/ApJS/230/28 : The populations of Carina. II. Abundances (Norris+, 2017)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/156/179 : r-process-enhanced field stars kinematics (Roederer+, 2018)J/ApJ/865/129 : Abundance analysis of HD 222925 (Roederer+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Gal. halo (Sakari+, 2018)J/ApJ/882/40 : Lanthanide distribution of metal-poor stars (Ji+, 2019)J/MNRAS/490/3508 : The Southern Stellar Stream Sp. Survey (S^5^) (Li+, 2019)J/ApJ/882/177 : Abundances of 4 member stars of Tucana III (Marshall+, 2019)J/MNRAS/484/2832 : Proper motions of MW globular clusters (Vasiliev, 2019)J/ApJ/875/L13 : DECam r & i magnitudes in the Fornax 6 cluster (Wang+, 2019)J/ApJ/898/150 : High-res. MIKE obs. of metal-poor stars (Ezzeddine+, 2020)J/ApJ/897/183 : Abundances of 3 stars in Grus II galaxy (Hansen+, 2020)J/ApJ/901/23 : Gjoll stream stars & abund. of 4 members (Hansen+, 2020)J/ApJS/249/30 : R-Process Alliance: metal-poor star sp. (Holmbeck+, 2020)J/AJ/160/181 : Chemical abundances in red giants with Magellan (Ji+, 2020)J/A+A/641/A127 : 13 dsph and ultra-faint galaxies analysis (Reichert+, 2020)J/ApJ/891/39 : LAMOST DR3 very metal-poor stars of Gal. halo (Yuan+, 2020)J/ApJ/908/79 : The r-process Alliance abundances (Gudin+, 2021)J/ApJ/912/52 : Abundances of 22 metal-poor stars in the MW (Gull+, 2021)J/ApJ/907/10 : The VMP HK/HES stars (Limberg+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/915/103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/915/103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/915/103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/915/103https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/915/103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/915/103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/915/103/table3Atomic data and abundances for individual neutron-capture element linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIonmeta.id;meta.maincharlambda[3702.85/7370.22] Wavelength in Angstroms0.1nmem.wlfloatExPot[0/2.94] Excitation potential in eVeVphys.atmol.excitationfloatlog(gf)[-1.93/0.81] log of degeneracy times oscillator strengthphys.atmol.oscStrengthfloatlog(eps)[-0.3/2.01] log epsilon abundancephys.abundfloate_log(eps)[0.06/0.7] Uncertainty in log(eps)stat.errorfloatr_log(gf)[1/23] Reference code on log(gf) (1)meta.ref;pos.frameint