J/MNRAS/544/3980ivo://CDS.VizieR/J/MNRAS/544/3980CDSNavabi M.Carrera R.Noel N.E.D.De Leo M.2026-09-18T10:53:14Z2026-09-18T11:51:57ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgiant-starsline-intensitiesmetallicityinfrared-astronomyTaking advantage of the near-infrared calcium triplet lines, we determine metallicities for a sample of more than 3500 red giant stars in the field of the Small Magellanic Cloud. We find a median metallicity of [Fe/H]=-1.05_/-0.01dex with a negative metallicity gradient of -0.064+/-0.007dex/deg between 1.2{deg} and 6.0{deg} consistent with an outside-in evolution scenario. For the first time, we detect hints of a positive metallicity gradient within 1.2{deg}, likely reflecting radial migration or centralized chemical enrichment. Azimuthal metallicity asymmetries are detected, with flatter gradients in the eastern and southern quadrants and steeper ones in the north and west. They are consistent with tidal interaction effects from the Large Magellanic Cloud. Finally, in spite of a clear distance and velocity bifurcations in the east, they seem to share a common chemical origin, in agreement with other studies.2025MNRAS.544.3980Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/544/3980CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/544/3980https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/544/3980http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/544/3980https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/544/3980https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/544/3980http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/544/3980GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/544/3980/smc_feh (CaII triplet equivalent-width measurements and derived metallicities for red giant stars in the Small Magellanic Cloud)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/544/3980/smc_feh?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/544/3980/smc_feh?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/544/3980/smc_feh?GETtext/xml+votable180.050000true22.5024512180744-72.00423726913220.0055555555555555564/2082 5/8238 8321-8324 8326 8332-8333 6/32942-32943 33300 33302 33308 33310-33311 33336-33338 33408-33409 33411-33414 33424 45317 45328https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/544/3980?format=asciiInfrareddefaultJ/MNRAS/544/3980/smc_fehCaII triplet equivalent-width measurements and derived metallicities for red giant stars in the Small Magellanic CloudrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier, 2MASSHHMMSSss+DDMMSSs (2MASS_id)meta.id;meta.maincharGaiaDR3Gaia DR3 source_id (Gaia_id)meta.idFieldField name (field)obs.fieldcharRA_ICRSRight ascension (ICRS) at Ep=2026.0 (RA)degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2026.0 (Dec)degpos.eq.dec;meta.mainEW8498Equivalent width of CaII triplet line at 849.8nm (EW8498)0.1nmspect.line.eqWidth;em.opt.IdoubleEW8542Equivalent width of CaII triplet line at 854.2nm (EW8542)0.1nmspect.line.eqWidth;em.opt.IdoubleEW8662Equivalent width of CaII triplet line at 866.2nm (EW8662)0.1nmspect.line.eqWidth;em.opt.Idoublee_EW8498rms uncertainty on EW8498 (e_EW8498)0.1nmstat.errordoublee_EW8542rms uncertainty on EW8542 (e_EW8542)0.1nmstat.errordoublee_EW8662rms uncertainty on EW8662 (e_EW8662)0.1nmstat.errordoubleEWSummed equivalent width of the three CaII triplet lines (EW = EW8498 + EW8542 + EW8662) (EW)0.1nmspect.line.eqWidthdoublee_EWrms uncertainty on EW (e_EW)0.1nmstat.error;spect.line.eqWidthdouble[Fe/H]GStellar metallicity [Fe/H] derived using the absolute magnitude in the Gaia G band as the luminosity indicator (FeH_G) (1)phys.abund.Zdoublee_[Fe/H]Grms uncertainty on [Fe/H]G (e_FeH_G) (2)stat.error;phys.abund.Fedouble[Fe/H]KStellar metallicity [Fe/H] derived using the absolute magnitude in the 2MASS Ks band as the luminosity indicator (FeH_K) (1)phys.abund.Fedoublee_[Fe/H]Krms uncertainty on [Fe/H]K (e_FeH_K) (2)stat.error;phys.abund.Fedouble