J/AJ/118/1245ivo://CDS.VizieR/J/AJ/118/1245doi:10.26093/cds/vizier.51181245CDSBrown J.A.Wallerstein G.Gonzalez G.2023-04-06T16:50:34Z2002-07-20T22:57:07ZCDS support team

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

cds-question@unistra.frchemical-abundancesglobular-star-clustersChemical abundances in five stars in M54, a globular cluster associated with the Sagittarius dwarf galaxy, have been determined using high-resolution echelle spectra. We find the cluster to have [Fe/H] = -1.55 and possibly halo-normal abundance patterns, although the [O/Fe] and [{alpha}/Fe] ratios lie between solar and the normal halo values. One star shows the combination of low oxygen and enhanced Na and Al, symptomatic of deep mixing of ON-cycle and other proton-capture products; a second star shows a lesser degree of O depletion unaccompanied by Na and Al excesses. In the cluster Eu is also enhanced, indicating that about 30% of the Ba in the cluster is due to the r-process. In general, M54 is similar to globulars of comparable metallicity in the inner Galactic halo, despite its clear association with the Sagittarius dwarf spheroidal.1999AJ....118.1245Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/118/1245CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/118/1245https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/118/1245http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/118/1245https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/118/1245https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/118/1245http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/118/1245GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/118/1245/table2Line data for the Ibata starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon namephys.atmol.ionizationcharAbdLog Ion's solar number abundance (H=12)phys.abundfloatWaveWavelength of Ion0.1nmem.wlfloatExPotExcitation potentialeVphys.energy;phys.atmol.excitationfloatlog(gf)Log of the oscillator strengthphys.atmol.wOscStrengthfloatEqWI1? Equivalent width for star Ibata 1 (in m{AA})0.0001nmspect.line.eqWidthfloatnullablef_EqWI1[a] Flag on EqWI1 (1)meta.code.errorcharn_EqWI1Special limit on EqWI1 ({<=} indicates less than or equal to)meta.notecharEqWI2? Equivalent width for star Ibata 2 (in m{AA})0.0001nmspect.line.eqWidthfloatnullablef_EqWI2[a] Flag on EqWI2 (1)meta.code.errorcharl_EqWI2Limit on EqWI2meta.code.errorcharEqWI10? Equivalent width for star Ibata 10 (in m{AA})0.0001nmspect.line.eqWidthfloatnullablef_EqWI10[a] Flag on EqWI10 (1)meta.code.errorcharEqWI11? Equivalent width for star Ibata 11 (in m{AA})0.0001nmspect.line.eqWidthfloatnullablef_EqWI11[a] Flag on EqWI11 (1)meta.code.errorcharl_EqWI11Limit on EqWI11meta.code.errorcharEqWI13? Equivalent width for star Ibata 13 (in m{AA})0.0001nmspect.line.eqWidthfloatnullablef_EqWI13[ab] Flag on EqWI13 (1)meta.code.errorchar