J/ApJ/859/75ivo://CDS.VizieR/J/ApJ/859/75doi:10.26093/cds/vizier.18590075CDSMucciarelli A.Lapenna E.Ferraro F.R.Lanzoni B.2020-08-25T14:15:54Z2019-06-03T12:38:50ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starschemical-abundancesradial-velocityvisible-astronomybroad-band-photometryinfrared-astronomyspectroscopyNGC 5824 is a massive Galactic globular cluster suspected to have an intrinsic spread in its iron content, according to the strength of the calcium triplet lines. We present chemical abundances of 117 cluster giant stars using high-resolution spectra acquired with the multi-object spectrograph FLAMES. The metallicity distribution of 87 red giant branch stars is peaked at [Fe/H]=-2.11+/-0.01dex, while that derived from 30 asymptotic giant branch stars is peaked at [Fe/H]=-2.20+/-0.01dex. Both the distributions are compatible with a null spread, indicating that this cluster did not retain the ejecta of supernovae. The small iron abundance offset between the two groups of stars is similar to the abundances already observed among red and asymptotic giant branch stars in other clusters. The lack of intrinsic iron spread rules out the possibility that NGC 5824 is the remnant of a disrupted dwarf galaxy, as previously suggested. We also find evidence of the chemical anomalies usually observed in globular clusters, namely the Na-O and the Mg-Al anticorrelations. In particular, NGC 5824 exhibits a huge range of [Mg/Fe] abundance, observed in only a few metal-poor and/or massive clusters. We conclude that NGC 5824 is a normal globular cluster, without spread in [Fe/H] but with an unusually large spread in [Mg/Fe], possibly due to an efficient self-enrichment driven by massive asymptotic giant branch stars.2018ApJ...859...75Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/859/75CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/118/1245 : Elemental abundances in five stars in M54 (Brown+, 1999)J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)J/A+A/505/117 : Abundances of red giants in 15 GCls (Carretta+, 2009)J/A+A/505/139 : Abundances of red giants in 17 GCls (Carretta+, 2009)J/ApJ/705/328 : Abundance measurements in Sculptor dSph (Kirby+, 2009)J/A+A/520/A95 : Abundances of red giants in M54 & Sgr dSph (Carretta+, 2010)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/ApJ/738/186 : HST and DEIMOS measurements of NGC 2419 stars (Ibata+, 2011)J/ApJ/731/64 : Spectroscopy of 300 RGBs in {omega} Cen (Marino+, 2011)J/ApJ/726/L20 : Spectroscopy of Terzan 5 (Origlia+, 2011)J/A+A/527/A18 : EW of 6 subgiants of {omega} Cen (Pancino+, 2011)J/ApJ/760/86 : Equivalent widths for 13 NGC2419 RGB stars (Cohen+, 2012)J/A+A/540/A27 : Spectroscopy in Galactic globular clusters (Saviane+, 2012)J/A+A/561/A87 : FLAMES observations of Terzan 8 (Carretta+, 2014)J/MNRAS/438/3507 : NGC 5824 calcium triplet equivalent widths (Da Costa+, 2014)J/ApJ/797/124 : AGB and RGB stars in 47 Tuc (Lapenna+, 2014)J/ApJ/795/22 : Iron abundance of Terzan 5 stars (Massari+, 2014)J/ApJ/813/97 : M62 (NGC 6266) giant branch star abundances (Lapenna+, 2015)J/MNRAS/450/815 : Red giants in NGC 5286 (Marino+, 2015)J/AJ/149/153 : Abundances of red giants in 10 GCls (Meszaros+, 2015)J/ApJ/801/69 : Iron EWs for 21 giant stars of NGC3201 (Mucciarelli+, 2015)J/AJ/152/21 : Red giant abundances in NGC6342 & NGC6366 (Johnson+, 2016)J/A+A/605/A46 : Sgr dSph nucleus stars abundances (Mucciarelli+, 2017)J/A+A/603/L7 : 6 giants atomic data and EWs (Mucciarelli+, 2017)J/A+A/601/A112 : GES iDR4 Mg-Al anticorrelation in GCs (Pancino+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/859/75https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/859/75http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/859/75https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/859/75https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/859/75http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/859/75GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/859/75/members (Parameters for the GIRAFFE target members of NGC 5824 (tables 1 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/859/75/members?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/859/75/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/859/75/members?GETtext/xml+votable180.050000true226.1162748-33.19757130.005555555555555556Cone search capability for table J/ApJ/859/75/table3 (Atmospheric parameters and abundance ratios for the UVES targets of NGC 5824)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/859/75/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/859/75/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/859/75/table3?GETtext/xml+votable180.050000true226.0207701-33.06693970.0055555555555555566/44084 440863.322582951404819e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/859/75?format=asciiOpticalInfrareddefaultJ/ApJ/859/75/membersParameters for the GIRAFFE target members of NGC 5824 (tables 1 and 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS14[8953/41744] Identifier from Sanna+ 2014ApJ...780...90Smeta.id;meta.mainint[DHS2014][11001198/71002877]? Identifier from Da Costa+ 2014, J/MNRAS/438/3507meta.id.crossintnullableRAJ2000[225.9/226.2] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-33.2/-32.9] Declination (J2000)degpos.eq.dec;meta.mainUmag[17.8/19.1] Apparent Johnson U band magnitudemagphot.mag;em.opt.UfloatVmag[15.5/18] Apparent Johnson V band magnitudemagphot.mag;em.opt.VfloatHRV[-42.6/-9.5] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.01/0.5] Uncertainty in HRVkm/sstat.errorfloatEvolEvolutionary sequence ("RGB"=87 occurrences; or "AGB")src.classcharTeff[4097/5107] Effective temperatureKphys.temperature.effectiveintlogg[0.5/1.9] log surface gravitylog(cm.s**-2)phys.gravityfloatVt[1.7/2.1] Turbulent velocitykm/sphys.veloc.microTurbfloat[Fe/H][-2.3/-1.9] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.05/0.09] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[Mg/Fe][-0.4/0.8] log Mg/Fe abundance ratiolog(Sun)phys.abundfloate_[Mg/Fe][0.02/0.2] Uncertainty in [Mg/Fe]log(Sun)stat.error;phys.abundfloatl_[Al/Fe]Lower limit flag on [Al/Fe]meta.code.error;phys.abundchar[Al/Fe][-0.2/1.4] log Al/Fe abundance ratiolog(Sun)phys.abundfloate_[Al/Fe][0.03/0.2]? Uncertainty in [Alg/Fe]log(Sun)stat.error;phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/859/75/table3Atmospheric parameters and abundance ratios for the UVES targets of NGC 5824recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS14[20836/35432] Sanna+ 2014ApJ...780...90S identifiermeta.id;meta.mainintTeff[4238/4344] Effective temperatureKphys.temperature.effectiveintlogg[0.6/0.9] log surface gravitylog(cm.s**-2)phys.gravityfloatVt[1.9/2] Turbulent velocitykm/sphys.veloc.microTurbfloat[Fe/H][-2.2/-2] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.06] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[O/Fe][-2.1/-1.9] log O/Fe abundance ratiolog(Sun)phys.abundfloate_[O/Fe][0.08/0.09] Uncertainty in [O/Fe]log(Sun)stat.error;phys.abundfloat[Na/Fe][0.08/0.09] log Na/Fe abundance ratiolog(Sun)phys.abundfloate_[Na/Fe][0.03/0.08] Uncertainty in [Na/Fe]log(Sun)stat.error;phys.abundfloat[Mg/Fe][-0.3/0.5] log Mg/Fe abundance ratiolog(Sun)phys.abundfloate_[Mg/Fe][0.02/0.08] Uncertainty in [Mg/Fe]log(Sun)stat.error;phys.abundfloatl_[Al/Fe]Limit flag on [Al/Fe]meta.code.error;phys.abundchar[Al/Fe][0.2/1.3] log Al/Fe abundance ratiolog(Sun)phys.abundfloate_[Al/Fe][0.03]? Uncertainty in [Al/Fe]log(Sun)stat.error;phys.abundfloatnullableRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/859/75/table2Wavelength, species, oscillator strength, excitation potential of the used transitionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4859.7/8868.5] Wavelength in Angstroms0.1nmem.wldoubleSpSpecies identifierphys.atmol.ionStagecharlog(gf)[-6.125/0.645] log oscillator strengthphys.atmol.oscStrengthfloatExPot[0.052/4.991] Excitation potentialeVphys.atmol.excitationfloatInstInstrument use in measurement ("UVES"=174 occurrences or "GIRAFFE")instr.setupchar