J/A+A/605/A46ivo://CDS.VizieR/J/A+A/605/A46doi:10.26093/cds/vizier.36050046CDSMucciarelli A.Bellazzini M.Ibata R.Romano D.Chapman S.C.Monaco L.2019-10-10T15:46:54Z2017-09-07T08:00:00ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopypopulation-ii-starschemical-abundancesWe present Iron, Magnesium, Calcium, and Titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9.0'~=70pc from the center) from medium-resolution Keck/DEIMOS spectra. All the considered stars belong to the massive globular cluster M 54 or to the central nucleus of the galaxy (Sgr,N). In particular we provide abundances for 109 stars with [Fe/H]>=-1.0, more than doubling the available sample of spectroscopic metallicity and {alpha}-elements abundance estimates for Sgr dSph stars in this metallicity regime. We find for the first time a metallicity gradient in the Sgr,N population, whose peak iron abundance goes from [Fe/H]=-0.38 for R<=2.5' to [Fe/H]=-0.57 for 5.0<R<=9.0 arcmin. On the other hand the trends of [Mg/Fe], [Ca/Fe], and [Ti/Fe] with [Fe/H] are the same over the entire region explored by our study. We reproduce the observed chemical patterns of the Sagittarius dwarf spheroidal as a whole with a chemical evolution model implying a high mass progenitor (M_DM_=6x10^10^M_{sun}_) and a significant event of mass-stripping occurred a few Gyr ago, presumably starting at the first peri-Galactic passage after infall.2017A&A...605A..46Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/605/A46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/459/777 : X-ray sources in Sagittarius & Carina dSph (Cignoni+, 2006)J/A+A/465/815 : Abundances of Sgr dSph stars (Sbordone+, 2007)J/A+A/513/A62 : Sgr dSph VIMOS photometry & RV (Giuffrida+, 2010)J/A+A/520/A95 : M54 and Sgr dSph red giants abundances (Carretta+, 2010)J/ApJ/756/74 : 2MASS view of Sgr dSph. VII. Kinematics (Frinchaboy+, 2012)J/AJ/145/163 : Catalog of stars in Sgr dwarf galaxy (Newby+, 2013)J/MNRAS/444/1812 : M54 red giants abundances (Mucciarelli+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/605/A46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/605/A46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/605/A46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/605/A46https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/605/A46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/605/A46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/605/A46/table1 (Atmospheric parameters and abundance ratios)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/605/A46/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/605/A46/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/605/A46/table1?GETtext/xml+votable180.050000true283.75277694-30.465706110.0055555555555555566/48035 48041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/605/A46?format=asciidefaultJ/A+A/605/A46/table1Atmospheric parameters and abundance ratiosrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1500190/4210645] Identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffEffective temperatureKphys.temperature.effectiveintlog(g)Surface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[Fe/H]Relative abundance [Fe/H]log(Sun)phys.abund.Fefloate_[Fe/H]Uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[Mg/Fe]? Relative abundance [Mg/Fe]log(Sun)phys.abundfloatnullablee_[Mg/Fe]? Uncertainty on [Mg/Fe]log(Sun)stat.error;phys.abundfloatnullable[Ca/Fe]Relative abundance [Ca/Fe]log(Sun)phys.abundfloate_[Ca/Fe]Uncertainty on [Ca/Fe]log(Sun)stat.error;phys.abundfloat[Ti/Fe]? Relative abundance [Ti/Fe]log(Sun)phys.abundfloatnullablee_[Ti/Fe]? Uncertainty on [Ti/Fe]log(Sun)stat.error;phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar