J/A+A/520/A95ivo://CDS.VizieR/J/A+A/520/A95doi:10.26093/cds/vizier.35200095CDSCarretta E. Bragaglia A.Gratton R.Lucatello S.Bellazzini M.,Catanzaro G.Leone F.Momany Y.Piotto G.D'Orazi V.2017-06-20T13:17:11Z2010-10-08T09:23:53ZCDS support team

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

cds-question@unistra.frgiant-starslate-type-starsHomogeneous abundances of light elements, alpha-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 red giants belonging to the Sgr nucleus. Our abundances assess the intrinsic metallicity dispersion (~0.19dex, rms scatter) of M 54, with the bulk of stars peaking at [Fe/H]~-1.6 and a long tail extending to higher metallicities, similar to {omega} Cen. The spread in these probable nuclear star clusters exceeds those of most GCs: these massive clusters are located in a region intermediate between normal GCs and dwarf galaxies. M 54 shows the Na-O anticorrelation, typical signature of GCs, which is instead absent in the Sgr nucleus. The light elements (Mg, Al, Si) participating to the high temperature Mg-Al cycle show that the entire pattern of (anti)correlations produced by proton-capture reactions in H-burning is clearly different between the most metal-rich and most metal-poor components in the two most massive GCs in the Galaxy, confirming early result based on the Na-O anticorrelation. As in {omega} Cen, stars affected by most extreme processing, i.e. showing the signature of more massive polluters, are those of the metal-rich component. These observations can be understood if the burst of star formation giving birth to the metal-rich component was delayed by as much as 10-30Myr with respect to the metal-poor one. The evolution of these massive GCs can be easily reconciled in the general scenario for the formation of GCs recently sketched in Carretta et al.(2010a) taking into account that {omega} Cen could have already incorporated the surrounding nucleus of its progenitor and lost the rest of the hosting galaxy while the two are still observable as distinct components in M 54 and the surrounding field.2010A&A...520A..95Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/520/A95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/118/1245 : Elemental abundances in five stars in M54 (Brown+, 1999)J/A+A/505/117 : Abundances of red giants in 15 globulars (Carretta+, 2009)J/A+A/505/139 : Abundances of red giants in 17 globulars (Carretta+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/520/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/520/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/520/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/520/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/520/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/520/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/520/A95/stars (Stars studied, identifications, positions, photometry, velocities, Teff, logg, [A/H], Vt and elemental abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/520/A95/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/520/A95/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/520/A95/stars?GETtext/xml+votable180.050000true283.763125-30.50772780.0055555555555555566/48035 48041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/520/A95?format=asciiOpticaldefaultJ/A+A/520/A95/starsStars studied, identifications, positions, photometry, velocities, Teff, logg, [A/H], Vt and elemental abundancesnTi1? Number of Ti I linesmeta.numberintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClM54 or SgrNmeta.id.parentcharIDIdentification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainBmagB magnitudemagphot.mag;em.opt.BfloatVmagV magnitudemagphot.mag;em.opt.VfloatImagI magnitudemagphot.mag;em.opt.IfloatKmagK magnitudemagphot.mag;em.IR.KfloatRV1? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullableRV2? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullableInstrInstrument (1)meta.id;instrcharTeffEffective temperatureKphys.temperature.effectiveintloggGravitylog(cm.s**-2)phys.gravityfloat[A/H]Metallicitylog(Sun)phys.abundfloatvtMicroturbulent velocitykm/sphys.velocfloatnFeINumber of FeI linesphys.abundint[Fe/H]1FeI (neutral iron) abundancelog(Sun)phys.abundfloate_[Fe/H]1rms on [Fe/H]1log(Sun)phys.abundfloatnFeII? Number of FeII linesphys.abundintnullable[Fe/H]2? FeII (ionized iron) abundancelog(Sun)phys.abundfloatnullablee_[Fe/H]2? rms on [Fe/H]2log(Sun)phys.abundfloatnullablenOnumber of O linesmeta.numberint[O/Fe]Oxygen abundancelog(Sun)phys.abundfloatf_[O/Fe][0,1]? 0=upper limit; 1=measure of Oxygenphys.abundintnullablee_[O/Fe]? rms on [O/Fe]log(Sun)phys.abundfloatnullablenNa? Number of Na linesmeta.numberintnullable[Na/Fe]? Sodium abundancelog(Sun)phys.abundfloatnullablee_[Na/Fe]? rms on [Na/Fe]log(Sun)phys.abundfloatnullablenMg? Number of Mg linesmeta.numberintnullable[Mg/Fe]? Magnesium abundancelog(Sun)phys.abundfloatnullablee_[Mg/Fe]? rms on [Mg/Fe]log(Sun)phys.abundfloatnullablenAl? Number of Al linesmeta.numberintnullable[Al/Fe]? Aluminum abundancelog(Sun)phys.abundfloatnullablef_[Al/Fe][0,1]? 0=upper limit; 1=measure of Aluminiumphys.abundintnullablee_[Al/Fe]? rms on [Al/Fe]log(Sun)phys.abundfloatnullablenSiNumber of Si linesmeta.numberint[Si/Fe]Silicon abundancelog(Sun)phys.abundfloate_[Si/Fe]? rms on [Si/Fe]log(Sun)phys.abundfloatnullablenCa? Number of Ca linesmeta.numberintnullable[Ca/Fe]? Calcium abundancelog(Sun)phys.abundfloatnullablee_[Ca/Fe]? rms on [Ca/Fe]log(Sun)phys.abundfloatnullable[Ti/Fe]1? Titanium (neutral) abundancelog(Sun)phys.abundfloatnullablee_[Ti/Fe]1? rms on [Ti/Fe]1log(Sun)phys.abundfloatnullablenTi2? Number of Ti II linesmeta.numberintnullable[Ti/Fe]2? Titanium (ionized) abundancelog(Sun)phys.abundfloatnullablenScNumber of Sc linesmeta.numberint[Sc/Fe]Scandium abundancelog(Sun)phys.abundfloate_[Sc/Fe]? rms on [Sc/Fe]log(Sun)phys.abundfloatnullablenV? Number of V linesmeta.numberintnullable[V/Fe]? Vanadium abundancelog(Sun)phys.abundfloatnullablee_[V/Fe]? rms on [V/Fe]log(Sun)phys.abundfloatnullablenCr? Number of Cr linesmeta.numberintnullable[Cr/Fe]? Cromium abundancelog(Sun)phys.abundfloatnullablee_[Cr/Fe]? rms on [Cr/Fe]log(Sun)phys.abundfloatnullablenMn? Number of Mn linesmeta.numberintnullable[Mn/Fe]? Manganese abundancelog(Sun)phys.abundfloatnullablee_[Mn/Fe]? rms on [Mn/Fe]log(Sun)phys.abundfloatnullablenCo? Number of Co linesmeta.numberintnullable[Co/Fe]? Cobalt abundancelog(Sun)phys.abundfloatnullablee_[Co/Fe]? rms on [Co/Fe]log(Sun)phys.abundfloatnullablenNi? Number of Ni linesmeta.numberintnullable[Ni/Fe]? Nichel abundancelog(Sun)phys.abundfloatnullablee_[Ni/Fe]? rms on [Ni/Fe]log(Sun)phys.abundfloatnullablenCu? Number of Cu linesmeta.numberintnullable[Cu/Fe]? Copper abundancelog(Sun)phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar