J/MNRAS/511/231ivo://CDS.VizieR/J/MNRAS/511/231doi:10.26093/cds/vizier.75110231CDSSchiappacasse-Ulloa J.Lucatello S.Rain M.J.Pietrinferni A.2026-05-06T20:07:21Z2025-02-14T13:15:19ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyglobular-star-clusterspopulation-ii-starsstellar-populationssupergiant-starsgiant-starschemically-peculiar-starsspectroscopyphotometryvisible-astronomyeffective-temperaturemetallicityThis paper presents a chemical abundance analysis of 217 stars in the metal-poor globular cluster NGC 6752, distributed from the turn-off to the lower red giant branch. Al and Li abundances were derived through spectral synthesis applied to spectra collected with FLAMES, in both GIRAFFE and UVES modes. The work aims to gain insight into the nature of the polluter(s) responsible for the abundance variations and the C-N, Na-O, Al-Mg anticorrelations associated with the multiple-population phenomenon. We found a plateau at A(Li) = 2.33 +/- 0.06 dex in unevolved stars, with the average Li content decreasing continuously down to ~1.25 dex at the bottom of the red giant branch. As expected in the classic anticorrelation scenario, we found stars low in Al and high in Li abundance, and stars high in Al and low in Li. However, in addition, we also found evidence of Al-rich, second-generation stars with high Li content. This finding suggests the need for Li production, known to happen in intermediate-mass (~4-8 M_{Sun}_) asymptotic giant branch stars through the Cameron-Fowler mechanism. It is worth noting that the Li abundance observed in Al-rich stars never exceeds that in Al- poor stars.2022MNRAS.511..231Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/511/231CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/567/A72 : Stellar parameters and abundances in NGC 6752 (Gruyters+, 2014)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/511/231https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/511/231http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/511/231https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/511/231https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/511/231http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/511/231GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/511/231/table1 (Stellar parameters of our stars in the metal-poor globular cluster NGC 6752)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/511/231/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/511/231/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/511/231/table1?GETtext/xml+votable180.050000true287.8578625-59.99767220.0055555555555555566/47125 47168https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/511/231?format=asciiOpticaldefaultJ/MNRAS/511/231/table1Stellar parameters of our stars in the metal-poor globular cluster NGC 6752recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier name from NGC 6752 IDs and 2MASS JHHMMSS.ss+DDMMSS.s designation (IDs)meta.id;meta.maincharTeffEffective temperature derived as explicited in sections 3.1 Photometric stellar parameters and 3.2 Spectroscopic stellar parameters (Teff)Kphys.temperature.effectivefloate_TeffDerived uncertainty of T_eff_ as explained in the section 3.5 Observational uncertainties (s_Teff)Kstat.error;phys.temperature.effectivefloatloggLogarithm of the surface gravity derived as explicited in sections 3.1 Photometric stellar parameters and 3.2 Spectroscopic stellar parameters (logg)log(cm.s**-2)phys.gravityfloate_loggDerived uncertainty of logg as explained in the section 3.5 Observational uncertainties (s_logg)log(cm.s**-2)stat.errorfloat[Fe/H]Iron to hydrogen abundance ratio adopted value -1.56 as explicited in sections 3.1 Photometric stellar parameters and 3.2 Spectroscopic stellar parameters (Fe_H)log(Sun)phys.abund.Fe;arith.ratiofloate_[Fe/H]Derived uncertainty 0.01 dex of [Fe/H] as explained in the section 3.5 Observational uncertainties (s_Fe)log(Sun)stat.error;phys.abund.FefloatvtMicroturbulence velocity derived as explicited in sections 3.1 Photometric stellar parameters and 3.2 Spectroscopic stellar parameters (vm_2)km/sphys.veloc.microTurbfloate_vtDerived uncertainty of vt as explained in the section 3.5 Observational uncertainties (s_vm)km/sstat.errorfloatA(Li)Lithium abundances as A(Li) = log(N_Li_/N_H_)+12 derived with equivalent widths measurements from spectroscopic analysis as explained in the section 3.2 Spectroscopic stellar parameters and 3.4 Measurement of Li and Al (Li1)phys.abundfloate_A(Li)Derived uncertainty of A(Li) as explained in the section 3.5 Observational uncertainties (s_Li)stat.errorfloat[Al/Fe]Aluminium to iron abundance ratio derived with equivalent widths measurements from spectroscopic analysis as explained in the section 3.2 Spectroscopic stellar parameters and 3.4 Measurement of Li and Al (Al_Fe1)phys.abunddoublee_[Al/Fe]Derived uncertainty of [Al/Fe] as explained in the section 3.5 Observational uncertainties (s_Al)stat.error;phys.abundfloatLinkLink to see the catalog of stellar parameters and abundances in NGC 6752 by Gruyters et al. 2014A&A...567A..72G, Cat. J/A+A/567/A72meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPosition from Gruyters et al. 2014A&A...567A..72G, Cat. J/A+A/567/A72 and from names 2MASS JHHMMSS.ss+DDMMSS.s (right ascension part)degpos.eq.ra;meta.main_DEPosition from Gruyters et al. 2014A&A...567A..72G, Cat. J/A+A/567/A72 and from names 2MASS JHHMMSS.ss+DDMMSS.s (declination part)degpos.eq.dec;meta.main