J/ApJ/882/177ivo://CDS.VizieR/J/ApJ/882/177doi:10.26093/cds/vizier.18820177CDSMarshall J.L.Hansen T.Simon J.D.Li T.S.Bernstein R.A.Kuehn K.,Pace A.B.DePoy D.L.Palmese A.Pieres A.Strigari L.Drlica-Wagner A.,Bechtol K.Lidman C.Nagasawa D.Q.Bertin E.Brooks D.Buckley-Geer E.,Burke D.L.Rosell A.C.Kind M.C.Carretero J.Cunha C.E.D'Andrea C.B.,da Costa L.N.De Vicente J.Desai S.Doel P.Eifler T.F.Flaugher B.,Fosalba P.Frieman J.Garcia-Bellido J.Gaztanaga E.Gerdes D.W.,Gruendl R.A.Gschwend J.Gutierrez G.Hartley W.G.Hollowood D.L.,Honscheid K.Hoyle B.James D.J.Kuropatkin N.Maia M.A.G.,Menanteau F.Miller C.J.Miquel R.Plazas A.A.Sanchez E.Santiago B.,Scarpine V.Schubnell M.Serrano S.Sevilla-Noarbe I.Smith M.,Soares-Santos M.Suchyta E.Swanson M.E.C.Tarle G.Wester W.2021-09-10T14:53:02Z2021-03-08T08:49:57ZCDS support team

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

cds-question@unistra.frmetallicityline-intensitiesradial-velocityvisible-astronomyspectroscopyWe present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: they are moderately enhanced in r-process elements, i.e., they have <[Eu/Fe]>~+0.4dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in {alpha}-elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.2019ApJ...882..177Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/882/177CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/357 : The Dark Energy Survey (DES): Data Release 1 (Abbott+, 2018)VII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/381/500 : Eu abundances in F and G disk stars (Koch+, 2002)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/A+A/455/271 : Abundances of red giants in NGC 6441 (Gratton+, 2006)J/A+A/464/967 : Abundances of red giants in NGC 6388 (Carretta+, 2007)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/763/61 : Abundances of 7 red giant members of BootesI (Gilmore+, 2013)J/ApJ/770/16 : Spectroscopic members of Segue 2 galaxy (Kirby+, 2013)J/ApJ/786/74 : EW measurements of 6 Segue 1 red giants (Frebel+, 2014)J/A+A/562/A146 : Chemical abundances of 8 metal-poor stars (Ishigaki+, 2014)J/MNRAS/440/2665 : SDSS J021933.13+200830.2 spectroscopy (Roederer+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/803/63 : gr photometry of stars in Kim 2 (Kim+, 2015)J/ApJ/808/95 : Spectroscopy of Reticulum II (Simon+, 2015)J/ApJ/808/108 : M2FS stellar spectroscopy of Reticulum 2 (Walker+, 2015)J/ApJ/826/110 : Boo-127 and Boo-980 high-resolution spectra (Frebel+, 2016)J/ApJ/830/93 : Abundances of Ret II brightest red giant members (Ji+, 2016)J/ApJ/817/41 : Abundances of 4 metal-poor red giants in BooII (Ji+, 2016)J/AJ/151/82 : 4 bright red giants in the UFD galaxy Ret 2 (Roederer+, 2016)J/ApJ/838/44 : Abundances of the brightest member of Tuc III (Hansen+, 2017)J/ApJ/838/83 : RVs, abundances & membership in TriII (Kirby+, 2017)J/ApJ/838/11 : Member stars in the MW satellite Tucana III (Simon+, 2017)J/ApJ/857/74 : Abundances of 7 new member stars in Tucana II (Chiti+, 2018)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/ApJ/866/22 : Spectroscopic analysis of Tuc III stream (Li+, 2018)J/ApJ/857/145 : MagLiteS Carina II and Carina III spectroscopy (Li+, 2018)J/ApJ/852/99 : Abundances of 3 metal-poor stars in Hor I (Nagasawa+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Gal. halo (Sakari+, 2018)J/ApJ/863/89 : Gaia DR2 PMs in ultra-faint MW satellites (Simon, 2018)J/ApJ/870/83 : Abundances in ultra-faint dwarf gal. GruI & TriII (Ji+, 2019)J/ApJ/875/77 : Proper motions of MW satellites with Gaia & DES (Pace+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/882/177https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/882/177http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/882/177https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/882/177https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/882/177http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/882/177GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/882/177/stars (Observing log (Table 1) and measured stellar parameters (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/882/177/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/882/177/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/882/177/stars?GETtext/xml+votable180.050000true358.88625-59.5208330.0055555555555555566/34944 46103 46144https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/882/177?format=asciiOpticaldefaultJ/ApJ/882/177/starsObserving log (Table 1) and measured stellar parameters (Table 2)SimbadNameSimbad column added by the CDSmeta.idcharVt[1.3/2] Microturbulent velocitykm/sphys.velocfloatf_Namec: from Hansen+ (2017, J/ApJ/838/44), included for referencemeta.codechare_logg[0.3] Logg uncertaintylog(cm.s**-2)stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNabundNumber of abundance measurements for this star (link to Table 3)meta.numberintnullableNameStar name (DES JHHMMSS+DDMMSS)meta.id;meta.maincharprimaryRAJ2000Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (1)pos.eq.dec;meta.maingmag[16/17.7] g-band magnitude (1)magphot.mag;em.opt.Bfloatg-r[0.5/0.8] g-r colour index (1)magphot.color;em.opt.B;em.opt.RfloatMJD[57248/57607.8] Modified Julian Date, at the midpoint of the observationdtime.epochdoubleExp[2/4.5] Exposure timehtime.duration;obs.exposurefloatSNR4200[10/30] Signal-to-noise ratio at 4200{AA}stat.snrintSNR5500[20/50] Signal-to-noise ratio at 5500{AA}stat.snrintLocLocationmeta.notecharHRV[-121.5/-92.6] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.3/1.1] HRV uncertaintykm/sstat.errorfloatTeff[4675/4900] Effective temperatureKphys.temperature.effectiveinte_Teff[100/150] Teff uncertaintyKstat.error;phys.temperature.effectiveintlogg[1.3/1.9] Log of surface gravitylog(cm.s**-2)phys.gravityfloate_Vt[0.3] Vt uncertaintykm/sstat.errorfloat[Fe/H][-2.7/-2.2] Log of Fe/ abundancelog(Sun)phys.abund.Fefloate_[Fe/H][0.08/0.2] [Fe/H] uncertaintylog(Sun)stat.error;phys.abund.FefloatJ/ApJ/882/177/table3FeI and FeII lines used for parameter determinationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTucana III star namemeta.id;meta.maincharIonAtomic species of absorption feature (FeI or FeII)phys.atmol.ionStagecharlambda[3765.54/8824.22] Rest wavelength of absorption feature0.1nmphys.absorptionfloatchi[0/4.6] Excitation potential of absorption lineeVphys.atmol.excitation;spect.linefloatloggf[-4.8/0.65] Oscillator strength of absorption linespect.line.intensityfloatEW[6/110] Measured equivalent width of absorption line0.1pmspect.line.eqWidthfloatloge[4.2/5.4] Measured chemical abundance from absorption featurephys.abundfloat