J/A+A/554/A81ivo://CDS.VizieR/J/A+A/554/A81doi:10.26093/cds/vizier.35540081CDSKacharov N.Koch A.McWilliam A.2017-06-01T08:53:02Z2013-06-10T08:06:46ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starschemical-abundancesM75 is a relatively young Globular Cluster (GC) found at 15kpc from the Galactic centre at the transition region between the inner and outer Milky Way halos. Our aims are to perform a comprehensive abundance study of a variety of chemical elements in this GC such as to investigate its chemical enrichment history in terms of early star formation, and to search for any multiple populations. We have obtained high resolution spectroscopy with the MIKE instrument at the Magellan telescope for 16 red giant stars. Their membership within the GC is confirmed from radial velocity measurements. Our chemical abundance analysis is performed via equivalent width measurements and spectral synthesis, assuming local thermodynamic equilibrium (LTE). We present the first comprehensive abundance study of M75 to date. The cluster is metal-rich ([Fe/H]=-1.16+/-0.02dex, [alpha/Fe]=+0.30+/-0.02dex), and shows a marginal spread in [Fe/H] of 0.07dex, typical of most GCs of similar luminosity. A moderately extended O-Na anticorrelation is clearly visible, likely showing three generations of stars, formed on a short timescale. Additionally the two most Na-rich stars are also Ba-enhanced by 0.4 and 0.6dex, respectively, indicative of pollution by lower mass (M~4-5M_{sun}_) Asymptotic Giant Branch (AGB) stars. The overall n-capture element pattern is compatible with predominant r-process enrichment, which is rarely the case in GCs of such a high metallicity.2013A&A...554A..81Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/554/A81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/469/529 : UBVI photometry of NGC 6864 (Kravtsov+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/554/A81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/554/A81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/554/A81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/554/A81https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/554/A81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/554/A81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/554/A81/stars (Star list (from Kravtsov et al. 2007, Cat. J/A+A/469/529))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/554/A81/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/554/A81/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/554/A81/stars?GETtext/xml+votable180.050000true301.5088-21.946272220.0055555555555555566/486982.367228618189496e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/554/A81?format=asciiOpticaldefaultJ/A+A/554/A81/starsStar list (from Kravtsov et al. 2007, Cat. J/A+A/469/529)spPlot of the spectrummeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar sequential number, <Cl* NGC 6864 KAM NNN> in Simbadmeta.recordintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatUmag? U magnitudemagphot.mag;em.opt.UfloatnullableBmagB magnitudemagphot.mag;em.opt.BfloatImagI magnitudemagphot.mag;em.opt.IfloatEWDisplay the equivalent widths measured for this starmeta.ref.urlchar[FeI/H]? [FeI/H] (Z=26) abundancelog(Sun)phys.abundfloatnullablee_[FeI/H]? Error on [FeI/H]log(Sun)stat.error;phys.abundfloatnullableo_[FeI/H]? Number of FeI lines usedmeta.numberintnullable[FeII/H]? [FeII/H] (Z=26) abundancelog(Sun)phys.abundfloatnullablee_[FeII/H]? Error on [FeII/H]log(Sun)stat.error;phys.abundfloatnullableo_[FeII/H]? Number of FeII lines usedmeta.numberintnullable[O/H]? [O/H] (Z=8) abundancelog(Sun)phys.abundfloatnullablee_[O/H]? Error on [O/H]log(Sun)stat.error;phys.abundfloatnullableo_[O/H]? Number of O lines usedmeta.numberintnullable[Na/H]? [Na/H] (Z=11) abundancelog(Sun)phys.abundfloatnullablee_[Na/H]? Error on [Na/H]log(Sun)stat.error;phys.abundfloatnullableo_[Na/H]? Number of Na lines usedmeta.numberintnullable[Mg/H]? [Mg/H] (Z=12) abundancelog(Sun)phys.abundfloatnullablee_[Mg/H]? Error on [Mg/H]log(Sun)stat.error;phys.abundfloatnullableo_[Mg/H]? Number of Mg lines usedmeta.numberintnullable[Al/H]? [Al/H] (Z=13) abundancelog(Sun)phys.abundfloatnullablee_[Al/H]? Error on [Al/H]log(Sun)stat.error;phys.abundfloatnullableo_[Al/H]? Number of Al lines usedmeta.numberintnullable[Si/H]? [Si/H] (Z=14) abundancelog(Sun)phys.abundfloatnullablee_[Si/H]? Error on [Si/H]log(Sun)stat.error;phys.abundfloatnullableo_[Si/H]? Number of Si lines usedmeta.numberintnullable[K/H]? [K/H] (Z=19) abundancelog(Sun)phys.abundfloatnullablee_[K/H]? Error on [K/H]log(Sun)stat.error;phys.abundfloatnullableo_[K/H]? Number of K lines usedmeta.numberintnullable[Ca/H]? [Ca/H] (Z=20) abundancelog(Sun)phys.abundfloatnullablee_[Ca/H]? Error on [Ca/H]log(Sun)stat.error;phys.abundfloatnullableo_[Ca/H]? Number of Ca lines usedmeta.numberintnullable[Sc/H]? [Sc/H] (Z=21) abundancelog(Sun)phys.abundfloatnullablee_[Sc/H]? Error on [Sc/H]log(Sun)stat.error;phys.abundfloatnullableo_[Sc/H]? Number of Sc lines usedmeta.numberintnullable[TiI/H]? [TiI/H] (Z=22) abundancelog(Sun)phys.abundfloatnullablee_[TiI/H]? Error on [TiI/H]log(Sun)stat.error;phys.abundfloatnullableo_[TiI/H]? Number of TiI lines usedmeta.numberintnullable[TiII/H]? [TiII/H] (Z=22) abundancelog(Sun)phys.abundfloatnullablee_[TiII/H]? Error on [TiII/H]log(Sun)stat.error;phys.abundfloatnullableo_[TiII/H]? Number of TiII lines usedmeta.numberintnullable[V/H]? [V/H] (Z=23) abundancelog(Sun)phys.abundfloatnullablee_[V/H]? Error on [V/H]log(Sun)stat.error;phys.abundfloatnullableo_[V/H]? Number of V lines usedmeta.numberintnullable[Cr/H]? [Cr/H] (Z=24) abundancelog(Sun)phys.abundfloatnullablee_[Cr/H]? Error on [Cr/H]log(Sun)stat.error;phys.abundfloatnullableo_[Cr/H]? Number of Cr lines usedmeta.numberintnullable[Mn/H]? [Mn/H] (Z=25) abundancelog(Sun)phys.abundfloatnullablee_[Mn/H]? Error on [Mn/H]log(Sun)stat.error;phys.abundfloatnullableo_[Mn/H]? Number of Mn lines usedmeta.numberintnullable[Co/H]? [Co/H] (Z=27) abundancelog(Sun)phys.abundfloatnullablee_[Co/H]? Error on [Co/H]log(Sun)stat.error;phys.abundfloatnullableo_[Co/H]? Number of Co lines usedmeta.numberintnullable[Ni/H]? [Ni/H] (Z=28) abundancelog(Sun)phys.abundfloatnullablee_[Ni/H]? Error on [Ni/H]log(Sun)stat.error;phys.abundfloatnullableo_[Ni/H]? Number of Ni lines usedmeta.numberintnullable[Cu/H]? [Cu/H] (Z=29) abundancelog(Sun)phys.abundfloatnullablee_[Cu/H]? Error on [Cu/H]log(Sun)stat.error;phys.abundfloatnullableo_[Cu/H]? Number of Cu lines usedmeta.numberintnullable[Zn/H]? [Zn/H] (Z=30) abundancelog(Sun)phys.abundfloatnullablee_[Zn/H]? Error on [Zn/H]log(Sun)stat.error;phys.abundfloatnullableo_[Zn/H]? Number of Zn lines usedmeta.numberintnullable[Rb/H]? [Rb/H] (Z=37) abundancelog(Sun)phys.abundfloatnullablee_[Rb/H]? Error on [Rb/H]log(Sun)stat.error;phys.abundfloatnullableo_[Rb/H]? Number of Rb lines usedmeta.numberintnullable[Y/H]? [Y/H] (Z=39) abundancelog(Sun)phys.abundfloatnullablee_[Y/H]? Error on [Y/H]log(Sun)stat.error;phys.abundfloatnullableo_[Y/H]? Number of Y lines usedmeta.numberintnullable[Zr/H]? [Zr/H] (Z=40) abundancelog(Sun)phys.abundfloatnullablee_[Zr/H]? Error on [Zr/H]log(Sun)stat.error;phys.abundfloatnullableo_[Zr/H]? Number of Zr lines usedmeta.numberintnullable[Ba/H]? [Ba/H] (Z=56) abundancelog(Sun)phys.abundfloatnullablee_[Ba/H]? Error on [Ba/H]log(Sun)stat.error;phys.abundfloatnullableo_[Ba/H]? Number of Ba lines usedmeta.numberintnullable[La/H]? [La/H] (Z=57) abundancelog(Sun)phys.abundfloatnullablee_[La/H]? Error on [La/H]log(Sun)stat.error;phys.abundfloatnullableo_[La/H]? Number of La lines usedmeta.numberintnullable[Ce/H]? [Ce/H] (Z=58) abundancelog(Sun)phys.abundfloatnullablee_[Ce/H]? Error on [Ce/H]log(Sun)stat.error;phys.abundfloatnullableo_[Ce/H]? Number of Ce lines usedmeta.numberintnullable[Pr/H]? [Pr/H] (Z=59) abundancelog(Sun)phys.abundfloatnullablee_[Pr/H]? Error on [Pr/H]log(Sun)stat.error;phys.abundfloatnullableo_[Pr/H]? Number of Pr lines usedmeta.numberintnullable[Nd/H]? [Nd/H] (Z=60) abundancelog(Sun)phys.abundfloatnullablee_[Nd/H]? Error on [Nd/H]log(Sun)stat.error;phys.abundfloatnullableo_[Nd/H]? Number of Nd lines usedmeta.numberintnullable[Sm/H]? [Sm/H] (Z=62) abundancelog(Sun)phys.abundfloatnullablee_[Sm/H]? Error on [Sm/H]log(Sun)stat.error;phys.abundfloatnullableo_[Sm/H]? Number of Sm lines usedmeta.numberintnullable[Eu/H]? [Eu/H] (Z=63) abundancelog(Sun)phys.abundfloatnullablee_[Eu/H]? Error on [Eu/H]log(Sun)stat.error;phys.abundfloatnullableo_[Eu/H]? Number of Eu lines usedmeta.numberintnullable[Gd/H]? [Gd/H] (Z=64) abundancelog(Sun)phys.abundfloatnullablee_[Gd/H]? Error on [Gd/H]log(Sun)stat.error;phys.abundfloatnullableo_[Gd/H]? Number of Gd lines usedmeta.numberintnullable[Dy/H]? [Dy/H] (Z=66) abundancelog(Sun)phys.abundfloatnullablee_[Dy/H]? Error on [Dy/H]log(Sun)stat.error;phys.abundfloatnullableo_[Dy/H]? Number of Dy lines usedmeta.numberintnullable[Er/H]? [Er/H] (Z=68) abundancelog(Sun)phys.abundfloatnullablee_[Er/H]? Error on [Er/H]log(Sun)stat.error;phys.abundfloatnullableo_[Er/H]? Number of Er lines usedmeta.numberintnullable[Hf/H]? [Hf/H] (Z=72) abundancelog(Sun)phys.abundfloatnullablee_[Hf/H]? Error on [Hf/H]log(Sun)stat.error;phys.abundfloatnullableo_[Hf/H]? Number of Hf lines usedmeta.numberintnullable[Th/H]? [Th/H] (Z=90) abundancelog(Sun)phys.abundfloatnullablee_[Th/H]? Error on [Th/H]log(Sun)stat.error;phys.abundfloatnullableo_[Th/H]? Number of Th lines usedmeta.numberintnullableSimbadSimbad column added by the CDSmeta.refcharJ/A+A/554/A81/table2Line-list and equivalent widthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElement name and ionisation stagemeta.id;phys.atmol.element;phys.atmol.ionizationcharlambdaWavelength in angstroms0.1nmem.wlfloatEPExcitation potentialeVphys.atmol.excitationfloatloggfOscillator strengthphys.atmol.oscStrengthfloatEW239? Equivalent widths for star #2390.1pmspect.line.eqWidthintnullableEW251? Equivalent widths for star #2510.1pmspect.line.eqWidthintnullableEW442? Equivalent widths for star #4420.1pmspect.line.eqWidthintnullableEW461? Equivalent widths for star #4610.1pmspect.line.eqWidthintnullableEW483? Equivalent widths for star #4830.1pmspect.line.eqWidthintnullableEW486? Equivalent widths for star #4860.1pmspect.line.eqWidthintnullableEW503? Equivalent widths for star #5030.1pmspect.line.eqWidthintnullableEW512? Equivalent widths for star #5120.1pmspect.line.eqWidthintnullableEW583? Equivalent widths for star #5830.1pmspect.line.eqWidthintnullableEW612? Equivalent widths for star #6120.1pmspect.line.eqWidthintnullableEW655? Equivalent widths for star #6550.1pmspect.line.eqWidthintnullableEW876? Equivalent widths for star #8760.1pmspect.line.eqWidthintnullableEW901? Equivalent widths for star #9010.1pmspect.line.eqWidthintnullableEW1251? Equivalent widths for star #12510.1pmspect.line.eqWidthintnullableEW1312? Equivalent widths for star #13120.1pmspect.line.eqWidthintnullableEW1459? Equivalent widths for star #14590.1pmspect.line.eqWidthintnullable