J/ApJ/959/141ivo://CDS.VizieR/J/ApJ/959/141CDSWebber K.B.Hansen T.T.Marshall J.L.Simon J.D.Pace A.B.,Mutlu-Pakdil B.Drlica-Wagner A.Martinez-Vazquez C.E.Aguena M.,Allam S.S.Alves O.Bertin E.Brooks D.Carnero Rosell A.,Carretero J.da Costa L.N.De Vicente J.Doel P.Ferrero I.,Friedel D.Frieman J.Garcia-Bellido J.Giannini G.Gruen D.,Gruendl R.A.Hinton S.R.Hollowood D.L.Honscheid K.Kuehn K.,Mena-Fernandez J.Menanteau F.Miquel R.Ogando R.L.C.Pereira M.E.S.,Pieres A.Plazas Malagon A.A.Sanchez E.Santiago B.Smith J.A.,Smith M.Suchyta E.Tarle G.To C.Weaverdyck N.Yanny B.2026-02-25T14:59:58Z2026-02-25T15:54:10ZCDS support team

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

cds-question@unistra.frchemical-abundancesdwarf-galaxiesline-intensitiesvisible-astronomyspectroscopyinfrared-photometrybroad-band-photometryradial-velocityWe present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES_J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the {alpha}-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ~11.2M_{sun}_. In addition, the star has a potassium abundance of [K/Fe]=0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.2023ApJ...959..141Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/959/141CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/A+A/512/A54 : Teff & Fbol from Infrared Flux Method (Casagrande+, 2010)J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)J/ApJ/724/341 : Nucleosynthesis of massive metal-free stars (Heger+, 2010)J/ApJ/723/1632 : Abundance spreads in Bootes I and Segue 1 (Norris+, 2010)J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/760/86 : Equivalent widths for 13 NGC2419 RGB stars (Cohen+, 2012)J/ApJ/750/76 : R-process peaks elements in HD 160617 (Roederer+, 2012)J/ApJ/769/40 : Potassium abundance in red giants of GCs (Carretta+, 2013)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/763/61 : Abund. of 7 red giant members of BootesI (Gilmore+, 2013)J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/ApJS/215/23 : FeI radiative lifetime (Den Hartog+, 2014)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/ApJS/215/20 : Vanadium log(gf) & transition probabilities (Lawler+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 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/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/ApJS/214/18 : VII log(gf) values, and V abundance in HD 84937 (Wood+ 2014)J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)J/ApJS/220/13 : Co I transition probabilities (Lawler+, 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/ApJS/225/24 : NuGrid stellar data set I. Yields (Pignatari+, 2016)J/AJ/151/82 : The 4 brightest red giants in Ret 2 (Roederer+, 2016)J/ApJ/817/53 : Fe abundances analysis in HD84937 (Sneden+, 2016)J/ApJ/838/44 : Abund. of the brightest member of Tuc III (Hansen+, 2017)J/ApJS/228/10 : Transition prob. for 183 lines of Cr II (Lawler+, 2017)J/ApJ/857/74 : Abundances of 7 new member stars in Tucana II (Chiti+, 2018)J/ApJ/855/83 : Abundances of VMP stars in Sagittarius (Hansen+, 2018)J/ApJ/859/75 : NGC 5824 giant star members from VLT (Mucciarelli+, 2018)J/ApJ/870/83 : Abundances in the UFD gal. GruI & TriII (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/ApJ/875/77 : PMs of MW satellites with Gaia & DES (Pace+, 2019)J/A+A/627/A177 : Non-LTE analysis of K I in late-type stars (Reggiani+, 2019)J/ApJ/890/119 : Iron abundances in 3 very metal-poor stars (Cowan+, 2020)J/ApJ/893/47 : MW satellite census. I. DES & PS1 (Drlica-Wagner+, 2020)J/ApJ/897/183 : Abundances of 3 stars in Grus II galaxy (Hansen+, 2020)J/AJ/160/181 : Chemical abundances in red giants with Magellan (Ji+, 2020)J/ApJ/889/27 : Abundances of 11 stars in Carina II and III (Ji+, 2020)J/ApJ/900/106 : Vanadium abundances for 255 metal-poor stars (Ou+, 2020)J/A+A/641/A127 : 13 dsph and ultra-faint galaxies analysis (Reichert+, 2020)J/other/Nat/583.768 : 2050 red giants CaII EWs (Wan+, 2020)J/ApJ/916/81 : Grus I and Indus II deep DES photometry (Cantu+, 2021)J/ApJ/921/67 : High-dis. sp. of 8 Phoenix stream red giants (Casey+, 2021)J/MNRAS/501/2279 : Stars in the Sagittarius stream (Vasiliev+, 2021)J/AJ/165/55 : Chemical abundances for 5 stars in Tucana II (Chiti+, 2023)J/AJ/165/100 : Stellar param. and abundances in Reticulum II (Ji+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/959/141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/959/141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/959/141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/959/141https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/959/141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/959/141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/959/141/table1 (Observing details and stellar data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/959/141/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/959/141/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/959/141/table1?GETtext/xml+votable180.050000true19.420417-17.5151390.0055555555555555566/16735https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/959/141?format=asciiOpticalInfrareddefaultJ/ApJ/959/141/table1Observing details and stellar datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharIDAbbreviated ID used in the papermeta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.maingmag0[16.443] Dereddened DES g-band magnitudemagphot.mag;em.opt.Bfloatrmag0[15.716] Dereddened DES r-band magnitudemagphot.mag;em.opt.Rfloatimag0[15.818] Dereddened DES i-band magnitudemagphot.mag;em.opt.Ifloatzmag0[16.014] Dereddened DES z-band magnitudemagphot.mag;em.opt.IfloatHJDHeliocentric Julian Date at the beginning of the exposuredtime.epochdoubleExpTimeExposure timesstime.duration;obs.exposurecharS/N[15/21] Signal-to-noise ratio per pixel at 4500{AA}stat.snr;instr.pixelintHRV[-81.9/-81.38] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.51/0.52] HRV uncertaintykm/sstat.error;spect.dopplerVeloc;pos.heliocentricfloatSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJ/959/141/table2Data for atomic lines used in analysis and individual line EW measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonSpecies identifierphys.atmol.ionStagecharlambda[3845.47/7698.96] Wavelength; Angstroms0.1nmem.wlfloatchi[0/5.1] Excitation potentialeVphys.atmol.excitationfloatloggf[-4.76/0.64] log oscillator strengthphys.atmol.oscStrengthfloatEW[14/269]? Equivalent width; milli-Angstroms1e-13mspect.line.eqWidthfloatnullablee_EW[2/17]? Uncertainty in EW1e-13mstat.error;spect.line.eqWidthfloatnullablelog(e)[-2.34/6.13] log number abundance relative to solarlog(Sun)phys.abundfloatRef[1/22] Reference code number (1)meta.bibint