J/ApJ/804/109ivo://CDS.VizieR/J/ApJ/804/109doi:10.26093/cds/vizier.18040109CDSBoberg O.M.Friel E.D.Vesperini E.2017-09-19T14:20:53Z2015-09-17T11:13:32ZCDS support team

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

cds-question@unistra.frline-intensitiesglobular-star-clustersradial-velocityabsolute-magnitudegiant-starsNGC 5053 provides a rich environment to test our understanding of the complex evolution of globular clusters (GCs). Recent studies have found that this cluster has interesting morphological features beyond the typical spherical distribution of GCs, suggesting that external tidal effects have played an important role in its evolution and current properties. Additionally, simulations have shown that NGC 5053 could be a likely candidate to belong to the Sagittarius dwarf galaxy (Sgr dSph) stream. Using the Wisconsin-Indiana-Yale-NOAO-Hydra multi-object spectrograph, we have collected high quality (signal-to-noise ratio ~75-90), medium-resolution spectra for red giant branch stars in NGC 5053. Using these spectra we have measured the Fe, Ca, Ti, Ni, Ba, Na, and O abundances in the cluster. We measure an average cluster [Fe/H] abundance of -2.45 with a standard deviation of 0.04 dex, making NGC 5053 one of the most metal-poor GCs in the Milky Way (MW). The [Ca/Fe], [Ti/Fe], and [Ba/Fe] we measure are consistent with the abundances of MW halo stars at a similar metallicity, with alpha-enhanced ratios and slightly depleted [Ba/Fe]. The Na and O abundances show the Na-O anti-correlation found in most GCs. From our abundance analysis it appears that NGC 5053 is at least chemically similar to other GCs found in the MW. This does not, however, rule out NGC 5053 being associated with the Sgr dSph stream.2015ApJ...804..109Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/804/109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/579/A104 : Abundances in NGC 5053 and NGC 5634 (Sbordone+, 2015)J/AJ/149/53 : RVs of 12 Milky Way globular clusters (Kimmig+, 2015)J/AJ/142/126 : CN & CH in SDSS Galactic globular clusters (Smolinski+, 2011)J/MNRAS/402/226 : NGC 5053 variables VrI light curves (Arellano Ferro+, 2010)J/ApJ/712/L21 : Calcium abundances in 17 globular clusters (Carretta+, 2010)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)J/AJ/132/85 : Equivalent width of 33 metal-poor RHB (Preston+, 2006)J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)J/A+A/350/955 : Atmospheric param. in metal-poor stars. II (Gratton+, 1999)J/AJ/112/1489 : Spectroscopic survey for binaries in NGC 5053 (Yan+ 1996)J/AJ/109/618 : RR Lyrae Stars in NGC 5053 (Nemec+ 1995)J/AJ/109/269 : Photometry of NGC 5053 (Sarajedini+ 1995)J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/804/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/804/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/804/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/804/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/804/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/804/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/804/109/table2 (Observational data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/804/109/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/804/109/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/804/109/table2?GETtext/xml+votable180.050000true199.111291717.68377780.0055555555555555566/27984 279863.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/804/109?format=asciiOpticaldefaultJ/ApJ/804/109/table2Observational dataMm[NY] Member?meta.code.membercharS/N[50/121] Signal-to-Noise ratiostat.snrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[2/23] Source identifier (1)meta.id;meta.mainintRAJ2000[13] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[17] Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[14/15.4] Apparent V band magnitude (1)magphot.mag;em.opt.VfloatVMagAbsolute V band magnitudemagphys.magAbs;em.opt.Vfloat(B-V)0[0.7/1.1] Intrinsic (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloat(V-K)0[1.8/2.8] Intrinsic (V-K) color indexmagphot.color;em.opt.V;em.IR.KfloatRVel[-27.1/44.2] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVel[0.6/2] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatEWsDisplay the equivalent width measurements for this starmeta.ref.urlchar2MDisplay the 2MASS data within 1" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/804/109/table4Equivalent widthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElSpecies name and ionization; I=neutral (CaI, FeI, NiI or TiI)meta.id;meta.maincharlambda[6102.7/6378.3] Wavelength0.1nmem.wlfloatlog(gf)[-4.5/0] log Oscillator Strengthphys.atmol.oscStrengthfloatEP[0.8/4.2] Potential EnergyeVphys.energy;phys.atmol.levelfloatEW2[13/127]? Equivalent width for Star 2 (1)0.1pmspect.line.eqWidthfloatnullableEW3[15/118]? Equivalent width for Star 3 (1)0.1pmspect.line.eqWidthfloatnullableEW4[12/117]? Equivalent width for Star 4 (1)0.1pmspect.line.eqWidthfloatnullableEW6[5/124]? Equivalent width for Star 6 (1)0.1pmspect.line.eqWidthfloatnullableEW9[8/110]? Equivalent width for Star 9 (1)0.1pmspect.line.eqWidthfloatnullableEW11[12/109]? Equivalent width for Star 11 (1)0.1pmspect.line.eqWidthfloatnullableEW12[13/120]? Equivalent width for Star 12 (1)0.1pmspect.line.eqWidthfloatnullableEW14[16/112]? Equivalent width for Star 14 (1)0.1pmspect.line.eqWidthfloatnullableEW15[8/106]? Equivalent width for Star 15 (1)0.1pmspect.line.eqWidthfloatnullableEW16[5/96]? Equivalent width for Star 16 (1)0.1pmspect.line.eqWidthfloatnullableEW17[5/112]? Equivalent width for Star 17 (1)0.1pmspect.line.eqWidthfloatnullableEW19[10/112]? Equivalent width for Star 19 (1)0.1pmspect.line.eqWidthfloatnullableEW20[3/102]? Equivalent width for Star 20 (1)0.1pmspect.line.eqWidthfloatnullableEW21[12/101]? Equivalent width for Star 21 (1)0.1pmspect.line.eqWidthfloatnullableEW23[4/93]? Equivalent width for Star 23 (1)0.1pmspect.line.eqWidthfloatnullable