J/A+A/572/A82ivo://CDS.VizieR/J/A+A/572/A82doi:10.26093/cds/vizier.35720082CDSHendricks B.Koch A.Walker M.Johnson C.I.Penarrubia J.Gilmore G.2017-06-30T05:48:15Z2014-12-01T09:01:36ZCDS support team

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

cds-question@unistra.frgalaxieschemical-abundancesline-intensitiesWe present radial velocities and [Fe/H] abundances for 340 stars in the Fornax dwarf spheroidal from R~16000 spectra. The targets were obtained in the outer parts of the galaxy. Our sample shows a wide range in [Fe/H], between -0.5 and -3.0dex, in which we detect three subgroups. Removal of stars belonging to the most metal-rich population produces a truncated metallicity distribution function that is identical to Sculptor, indicating that these systems shared a similar early evolution. The derived age-metallicity relation shows a fast increase in [Fe/H] at early ages, after which the enrichment flattens significantly for stars younger than ~8Gyr. Additionally, the data indicate a strong population of stars around 4Gyr, followed by a second rapid enrichment in [Fe/H]. Our dynamical analysis reveals an increasing velocity dispersion with decreasing [Fe/H] from sigma_sys_=7.5km/s to 14km/s. The large velocity dispersion at low metallicities is possibly the result of a non-Gaussian velocity distribution among stars older than ~8Gyr. Our sample also includes members from the Fornax globular clusters H2 and H5. In agreement with past studies we find [Fe/H]=-2.04+/-0.04 and a mean radial velocity RV=59.36+/-0.31km/s for H2 and [Fe/H]=-2.02+/-0.11 and RV=59.39+/-0.44km/s for H5. Overall, we find high complexity in the chemical and dynamical properties, with signatures that additionally vary with galactocentric distance.2014A&A...572A..82Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/572/A82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/131/912 : BR photometry of Fornax dSph center (Olszewski+, 2006)J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006)J/ApJ/701/1323 : Variable stars in Fornax dSph. III. (Greco+, 2009)J/A+A/523/A17 : Individual stars in Fornax dSph center (Letarte+, 2010)J/A+A/544/A73 : BVI photometry of Fornax dSph galaxy (de Boer+, 2012)J/A+A/550/A18 : XMM X-ray sources in Fornax dwarf galaxy (Nucita+, 2013)J/A+A/562/A24 : Cool carbon stars in the halo and Fornax dSph (Mauron+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/572/A82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/572/A82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/572/A82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/572/A82https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/572/A82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/572/A82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/572/A82/stars (Chemodynamical properties of the stars observed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/572/A82/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/572/A82/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/572/A82/stars?GETtext/xml+votable180.050000true39.3008333-34.86393890.0055555555555555566/35968-35969 359723.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/572/A82?format=asciiOpticaldefaultJ/A+A/572/A82/starsChemodynamical properties of the stars observedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHSimbad column added by the CDSmeta.id.parentintnullableStar[1/431] Star sequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainS/N[10/53] Signal-to-noise per pixelstat.snr;instr.pixelfloatRV[26/87] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.5/3.6] Error on RVkm/sstat.errorfloatVmag[18/21] V magnitudemagphot.mag;em.opt.Vfloate_Vmag[0/0.2] Error on Vmagmagstat.error;phot.mag;em.opt.VfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloate_V-IError on V-Imagstat.error;phot.color;em.opt.Vfloat[Fe/H]Ca[-3/-0.4] Metallicity derived from Calcium Triplet (CaT)log(Sun)phys.abund.Fefloate_[Fe/H]CaError on [Fe/H]Calog(Sun)stat.error;phys.abund.FefloatAge? Stellar ageGyrtime.agefloatnullableEWCaT1Equivalent width of CaT1 line (849.8nm)0.1nmspect.line.eqWidthfloatEWCaT2Equivalent width of CaT2 line (854.2nm)0.1nmspect.line.eqWidthfloatEWCaT3Equivalent width of CaT3 line (866.2nm)0.1nmspect.line.eqWidthfloatEWMg? Equivalent width of Mg line at 880.7nm0.1nmspect.line.eqWidthfloatnullable[Fe/H]HR[-6.9/0.5]? Metallicity derived from Fe absorption featureslog(Sun)phys.abund.Fefloatnullablee_[Fe/H]HR? Error on [Fe/H]HRlog(Sun)stat.error;phys.abund.Fefloatnullable[Mg/Fe]? Derived [Mg/Fe] abundancelog(Sun)phys.abundfloatnullablee_[Mg/Fe]? Error on [Mg/Fe]log(Sun)stat.error;phys.abundfloatnullable[Si/Fe]? Derived [Si/Fe] abundancelog(Sun)phys.abundfloatnullablee_[Si/Fe]? Error on [Si/Fe]log(Sun)stat.error;phys.abundfloatnullable[Ti/Fe]? Derived [Ti/Fe] abundancelog(Sun)phys.abundfloatnullablee_[Ti/Fe]? Error on [Ti/Fe] abundancelog(Sun)stat.error;phys.abundfloatnullablechi2[0/5]? Normalized {chi}^2^ fit (1)stat.fit.param;arith.ratio;meta.modelledfloatnullable