J/MNRAS/510/1894ivo://CDS.VizieR/J/MNRAS/510/1894doi:10.26093/cds/vizier.75101894CDSKovtyukh V.Lemasle B.Bono G.Usenko I.A.Da Silva R.Kniazev A.,Grebel E.K.Andronov I.L.Shakun L.Chinarova L.2025-02-13T20:15:35Z2024-11-18T12:03:33ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyvariable-starsastronomical-modelsstellar-atmospheresvisible-astronomyspectroscopychemical-abundancesmetallicitygalactic-centergalaxy-planesastrometrystellar-distanceeffective-temperatureRadial abundance gradients provide sound constraints for chemo-dynamical models of galaxies. Azimuthal variations of abundance ratios are solid diagnostics to understand their chemical enrichment. In this paper, we investigate azimuthal variations of abundances in the Milky Way using Cepheids. We provide the detailed chemical composition (25 elements) of 105 Classical Cepheids from high- resolution SALT spectra observed by the MAGIC project. Negative abundance gradients, with abundances decreasing from the inner to the outer disc, have been reported both in the Milky Way and in external galaxies, and our results are in full agreement with literature results. We find azimuthal variations of the oxygen abundance [O/H]. While a large number of external spirals show negligible azimuthal variations, the Milky Way seems to be one of the few galaxies with noticeable [O/H] azimuthal asymmetries. They reach =~0.2 dex in the inner Galaxy and in the outer disc, where they are the largest, thus supporting similar findings for nearby spiral galaxies, as well as recent 2D chemo-dynamical models.2022MNRAS.510.1894Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/510/1894CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/381/32 : Galactic Cepheid abundances (Andrievsky+, 2002)J/AJ/156/171 : Cepheid abund.: multiphase results & spatial gradientsJ/A+A/616/A82 : Physical parameters of classical Cepheids (Proxauf+, 2018)J/ApJ/885/131 : ~200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/AcA/69/305 : Northern Galactic disk classical Cepheids (Skowron+, 2019)J/ApJ/852/78 : JHKs, WISE and Spitzer data of Galactic Cepheids (Wang+, 2018)https://astronomers.salt.ac.za/ : SALT data home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/510/1894https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/510/1894http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/510/1894https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/510/1894https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/510/1894http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/510/1894GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/510/1894/table1 (Spectra informations and atmospheric parameters for the investigated Cepheids)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/510/1894/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/510/1894/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/510/1894/table1?GETtext/xml+votable180.050000true108.2986472-18.73075080.005555555555555556Cone search capability for table J/MNRAS/510/1894/table2 (Helio/Galactocentric distribution of our 105 cepheids sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/510/1894/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/510/1894/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/510/1894/table2?GETtext/xml+votable180.050000true108.3002-18.7230.0055555555555555566/20820 20827 20850 20863 20957 20978 21635 21638 21704 22078 22089-22090 22181 22193 22223 22268 22270 28713 28804 28806 28910 28917-28918 29032 29090-29091 29095 29106 29159-29160 29249 29521 29526 30243 30327 30496 30608 37205 37247 37329 37332-37333 37340 37342 37359 37362-37363 37366 37711 37734 37737 37747 37813 37869 37904-37905 37913 37915 37923 37926 37929 37931 37934 37939 38024 38417 38435 39244 39269 39283 39295 39380-39382 39405 39417 39419 39704 39743 39748 39771 39773 39790 39805 39885 39977 40450 40482 40488 40494 40613 40634 41621-41622 41661 41673-41674 41713 41759 41780 41794 41800 41833 41858 41860 41862 42155 42166 42171 42202 42224 42453 42496 43013 43020 43022-43023 43044 43722https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/510/1894?format=asciiOpticaldefaultJ/MNRAS/510/1894/table1Spectra informations and atmospheric parameters for the investigated CepheidsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject cepheid name (Object)meta.id;meta.maincharMJDModified Julian Date (MJD-2450000)dtime.epochdoubleExpTimeExposure time (Exptime)stime.duration;obs.exposureintTeffEffective temperature (Teff) (1)Kphys.temperature.effectiveinte_TeffMean 1 {sigma} Teff uncertainty ({sigma})Kstat.error;phys.temperature.effectiveinto_TeffThe number N of line depth ratios used to derive Teff (N)meta.numberintSETeff? Standard error of the mean value Teff computed as {sigma}/sqrt(N) ({sigma}/sqrtN)Kstat.errorfloatnullablelog(g)? Logarithm of surface gravity (logg) (2)log(cm.s**-2)phys.gravityfloatnullableVt? Microturbulence velocity (Vt) (2)km/sphys.veloc.microTurbfloatnullable[Fe/H]? Abundance [Fe/H] in solar units ([Fe/H]) (3)log(Sun)phys.abundfloatnullablee_[Fe/H]? Mean 1 {sigma} [Fe/H] uncertainty (Sigma)log(Sun)stat.error;phys.abund.Fefloatnullableo_[Fe/H]? The number N of Fe I lines used to derive [Fe/H] (n)meta.numberintnullableRemarksAdditional remarks (Remarks)meta.notechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/510/1894/table2Helio/Galactocentric distribution of our 105 cepheids samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedObjectObject cepheid name (Object)meta.id;meta.maincharGLONGalactic longitude (l) (1)degpos.galactic.lonGLATGalactic latitude (b) (1)degpos.galactic.latDHeliocentric distance (Distance) (1)pcpos.distance;pos.heliocentricintPPulsation mode period (Period) (1)dtime.perioddoubleMode[F 1O] Pulsation mode (Mode) (2)meta.code;src.varcharphiThe cepheid azimuthal angle {phi} ({phi}) (3)degpos.posAngfloatRgGalactocentric distances (Rg) (1)kpcpos.distance;pos.galactocentricfloat[Fe/H]Abundance [Fe/H] in solar units ([Fe/H]) (4)log(Sun)phys.abundfloatJ/MNRAS/510/1894/table3*Abundances from C to Mn of our cepheids samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject cepheid name (Object)meta.id;meta.mainchar[C/H]? Carbon abundancephys.abundfloatnullable[N/H]? Nitrogen abundancephys.abundfloatnullable[O/H]? Oxygen abundancephys.abundfloatnullable[Na/H]? Sodium abundancephys.abundfloatnullable[Mg/H]? Magnesium abundancephys.abundfloatnullable[Al/H]? Aluminium abundancephys.abundfloatnullable[Si/H]? Silicon abundancephys.abundfloatnullable[S/H]? Sulfur abundancephys.abundfloatnullable[Ca/H]? Calcium abundancephys.abundfloatnullable[Sc/H]? Scandium abundancephys.abundfloatnullable[Ti/H]? Titanium abundancephys.abundfloatnullable[V/H]? Vanadium abundancephys.abundfloatnullable[Cr/H]? Chromium abundancephys.abundfloatnullable[Mn/H]? Manganese abundancephys.abundfloatnullableJ/MNRAS/510/1894/table4*Abundances from Fe to Gd of our cepheids samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject cepheid name (Object)meta.id;meta.mainchar[Fe/H]? Iron abundancephys.abund.Fefloatnullable[Co/H]? Cobalt abundancephys.abundfloatnullable[Ni/H]? Nichel abundancephys.abundfloatnullable[Y/H]? Yttrium abundancephys.abundfloatnullable[Zr/H]? Zirconium abundancephys.abundfloatnullable[La/H]? Lanthanum abundancephys.abundfloatnullable[Ce/H]? Cerium abundancephys.abundfloatnullable[Pr/H]? Praseodymium abundancephys.abundfloatnullable[Nd/H]? Neodymium abundancephys.abundfloatnullable[Sm/H]? Samarium abundancephys.abundfloatnullable[Eu/H]? Europium abundancephys.abundfloatnullable[Gd/H]? Gadolinium abundancephys.abundfloatnullable