J/ApJ/801/69ivo://CDS.VizieR/J/ApJ/801/69doi:10.26093/cds/vizier.18010069CDSMucciarelli A.Lapenna E.Massari D.Ferraro F.R.Lanzoni B.2022-05-02T14:43:43Z2015-08-06T13:52:30ZCDS support team

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

cds-question@unistra.frline-intensitiesmetallicityradial-velocitygiant-starsglobular-star-clustersNGC 3201 is a globular cluster suspected to have an intrinsic spread in the iron content. We re-analyzed a sample of 21 cluster stars observed with UVES-FLAMES at the Very Large Telescope and for which Simmerer et al. (2013ApJ...764L...7S) found a 0.4dex wide [Fe/H] distribution with a metal-poor tail. We confirmed that when spectroscopic gravities are adopted, the derived [Fe/H] distribution spans ~0.4dex. On the other hand, when photometric gravities are used, the metallicity distribution from Fe I lines remains large, while that derived from Fe II lines is narrow and compatible with no iron spread. We demonstrate that the metal-poor component claimed by Simmerer et al. (2013ApJ...764L...7S) is composed by asymptotic giant branch stars that could be affected by non-local thermodynamical equilibrium effects driven by iron overionization. This leads to a decrease of the Fe I abundance, while leaving the Fe II abundance unaltered. A similar finding has been already found in asymptotic giant branch stars of the globular clusters M5 and 47 Tucanae. We conclude that NGC 3201 is a normal cluster, with no evidence of intrinsic iron spread.2015ApJ...801...69Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/801/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/eso : ESO Science Archive Catalog (ESO, 1991-2015)B/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJ/780/94 : Abundances of red giants in 47 Tuc (Cordero+, 2014)J/A+A/527/A18 : EW of 6 subgiants of {omega} Cen (Pancino+, 2011)J/ApJ/726/L20 : Spectroscopy of Terzan 5 (Origlia+, 2011)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/A+A/517/A81 : 2nd & 3d param. of HB of globular clusters (Gratton+, 2010)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008)J/AJ/134/1298 : CaII EWs in 29 Galactic clusters (Carrera+, 2007)J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)J/AJ/130/2140 : Abundances & velocities in globular clusters (Pritzl+, 2005)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/PAZh/22/269 : Giant branch and variable stars in NGC 3201 (Samus+, 1996)J/ApJS/90/83 : Binaries in NGC 3201 (Cote+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/801/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/801/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/801/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/801/69https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/801/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/801/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/801/69/table1 (Main information of the target stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/801/69/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/801/69/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/801/69/table1?GETtext/xml+votable180.050000true154.308468-46.4125790.0055555555555555566/38465https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/801/69?format=asciidefaultJ/ApJ/801/69/table1Main information of the target starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[63/374] Star identification number (G1)meta.id;meta.mainintprimaryRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmag[12.6/14] V-band magnitudemagphot.mag;em.opt.VfloatImag[11/12.6] I-band magnitudemagphot.mag;em.opt.IfloatHRV[487/500] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.2/1] HRV uncertaintykm/sstat.errorfloatTeff[4330/4920] Effective temperatureKphys.temperature.effectiveintlogg[0.8/1.7] Surface gravitylog(cm.s**-2)phys.gravityfloatVt[1.4/1.9] Microturbulent velocitykm/sphys.velocfloat[FeI/H][-1.7/-1.2] FeI metallicity (1)log(Sun)phys.abund.Zfloate_[FeI/H][0.02/0.05] [FeI/H] uncertaintylog(Sun)stat.error;phys.abundfloat[FeII/H][-1.5/-1.2] FeII metallicity (1)log(Sun)phys.abund.Zfloate_[FeII/H][0.03/0.06] [FeII/H] uncertaintylog(Sun)stat.error;phys.abundfloatEWsNumber of equivalent width measures (table 2)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/801/69/table2Star identification number, wavelength, oscillator strength, excitation potential and measured EWs for all the used transitionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[63/374] Star identification number (G1)meta.id;meta.mainintlambda[4791/6753] Wavelength {lambda}0.1nmem.wldoubleIonIon identification (FeI or FeII)phys.atmol.ionStagecharlog(gf)[-6.2/0.7] Log of the oscillator strengthphys.atmol.oscStrengthfloatExPot[0.05/5] Excitation potentialeVphys.atmol.excitationfloatEW[12/132] Equivalent width in m{AA}0.1pmspect.line.eqWidthfloat