J/ApJ/887/91ivo://CDS.VizieR/J/ApJ/887/91doi:10.26093/cds/vizier.18870091CDSMarino A.F.Milone A.P.Sills A.Yong D.Renzini A.Bedin L.R.,Cordoni G.D'Antona F.Jerjen H.Karakas A.Lagioia E.Piotto G.,Tailo M.2022-11-03T06:43:12Z2021-06-16T07:51:46ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starsline-intensitiesradial-velocityvisible-astronomybroad-band-photometryultraviolet-astronomychemical-abundancesThe Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs) has investigated multiple stellar populations by means of the "chromosome map" (ChM) diagnostic tool that maximizes the separation between stars with different chemical compositions. One of the most challenging features revealed by ChM analysis is the apparent inhomogeneity among stars belonging to the first population, a phenomenon largely attributed to He variations. However, this explanation is not supported by uniformity in the p-capture elements of these stars. The HST survey has revealed that the GC NGC 3201 shows exceptionally wide coverage in the {Delta}_F275W,F814W_ parameter of the ChM. We present a chemical abundance analysis of 24 elements in 18 giants belonging to the first population of this GC and having a wide range in {Delta}_F275W,F814W_. As far as the p-capture elements are concerned, the chemical abundances are typical of first-generation (1G) stars, as expected from the location of our targets in the ChM. Based on radial velocities and chemical abundance arguments, we find that the three stars with the lowest {Delta}_F275W,F814W_ values are binary candidates. This suggests that at least those stars could be explained with binarity. These results are consistent with evidence inferred from multiband photometry that evolved blue stragglers (BSs) populate the bluest part of the 1G sequence in the ChM. The remaining 15 spectroscopic targets show a small range in the overall metallicity by ~0.10dex, with stars at higher {Delta}_F275W,F814W_ values having higher absolute abundances. We suggest that a small variation in metals and binarity governs the color spread of the 1G in the ChM and that evolved BSs contribute to the bluest tail of the 1G sequence.2019ApJ...887...91Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/887/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/133/1658 : ACS survey of galactic globular clusters (Sarajedini+, 2007)J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)J/A+A/497/371 : UBVI photometry of NGC 3201 (Kravtsov+, 2009)J/ApJ/696/797 : Evolution and yields of low-mass AGB stars (Cristallo+, 2009)J/A+A/503/541 : Neutral Li in late-type stars (Lind+, 2009)J/A+A/503/545 : Equivalent widths of Li, Na, Fe, Ca in NGC 6397 (Lind+, 2009)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/AcA/62/357 : Proper motions in 6 globular clusters (Zloczewski+, 2012)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/ApJ/797/44 : Evolution and nucleosynthesis of AGB stars (Fishlock+, 2014)J/ApJ/801/69 : Iron EWs for 21 giant stars of NGC3201 (Mucciarelli+, 2015)J/MNRAS/450/815 : Red giants in NGC 5286 (Marino+, 2015)J/A+A/581/A72 : ubvy photometry of NGC2419 (Frank+, 2015)J/MNRAS/463/696 : M67 solar twins chemical compositions (Liu+, 2016)J/MNRAS/471/1446 : Ground-based proper motion of 12 nearby GC (Narloch+, 2017)J/ApJ/864/57 : Abundances of field & GC RR Lyrae I. NGC3201 (Magurno+, 2018)J/A+A/614/A146 : Stellar parameters of NGC3201 RGB stars (Dias+, 2018)J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)J/A+A/628/A54 : Fe, Mg, Ti in Galactic clusters (Kovalev+, 2019)J/A+A/632/A3 : MUSE binaries in NGC 3201 (Giesers+, 2019)J/MNRAS/485/3042 : UBVRI photometry in 48 globular clusters (Stetson+, 2019)J/MNRAS/488/3024 : GC members with Gaia DR2 (Bustos Fierro+, 2019)J/A+A/635/A114 : EW & [Fe/H] for 30000 GC RGB stars (Husser+ 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/887/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/887/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/887/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/887/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/887/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/887/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/887/91/giants (Observed giants in NGC3201 (Table 1) and adopted atmospheric parameters derived from spectroscopy (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/887/91/giants?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/887/91/giants?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/887/91/giants?GETtext/xml+votable180.050000true154.3813125-46.409627780.0055555555555555566/38465https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/887/91?format=asciiUVOpticaldefaultJ/ApJ/887/91/giantsObserved giants in NGC3201 (Table 1) and adopted atmospheric parameters derived from spectroscopy (Table 2)SimbadSimbad column added by the CDSmeta.ref.urlchardelTTime interval (maximum time between observations)time.intervalcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[14/160] Identifiermeta.id;meta.mainintprimaryRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainVmag[13.64/15.42] V-band magnitudemagphot.mag;em.opt.VfloatColor1[-0.28/0.08] {Delta}_F275W,F814W_magphot.color;em.UV;em.optfloatlogg[1.6/2.53] Log of surface gravitylog(cm.s**-2)phys.gravityfloatColor2[-0.02/0.1] {Delta}_F275W,F336W,F438W_magphot.color;em.UV;em.optfloatRV[490.8/506.8] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.08/0.8] RV uncertaintykm/sstat.errorfloatNexp[5/23] Number of exposuresmeta.numberintNewNumber of equivalent width measurements for this star (link to Table 3)meta.numberintnullableTeff[4650/5000] Effective temperatureKphys.temperature.effectiveint[A/H][-1.68/-1.39] Abundance of [A/H]log(Sun)phys.abundfloatVt[1.36/1.64] Microturbulent velocitykm/sphys.velocfloatlogFeI[5.82/6.11] log of FeI abundancephys.abund.Fefloate_logFeI[0.08/0.11] LogFeI uncertaintystat.errorfloato_logFeI[110/133] Number of observations for logFeImeta.numberintlogFeII[5.88/6.18] log of FeII abundancephys.abund.Fefloate_logFeII[0.04/0.09] LogFeII uncertaintystat.errorfloato_logFeII[12/13] Number of observations for logFeIImeta.numberintTeffp[4507/4940] Photometric effective temperatureKphys.temperature.effectiveintloggp[1.54/2.48] Photometric logglog(cm.s**-2)phys.gravity;photfloatJ/ApJ/887/91/table3Atomic data and equivalent widths for program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[14/160] Star numbermeta.id;meta.mainintlambda[4788.7/6806.9] Wavelength in Angstrom units0.1nmem.wldoubleIon[11/60.1] Chemical speciesphys.atmol.ionStagefloatEP[0/5.62] Excitation potentialeVphys.atmol.excitationfloatloggf[-6/0.63] Total oscillator strengthphys.atmol.oscStrengthfloatEW[2/175.3] Equivalent width in milli-Angstrom units0.1pmmeta.unit;spect.line.eqWidthfloat