J/ApJ/682/1029ivo://CDS.VizieR/J/ApJ/682/1029doi:10.26093/cds/vizier.16821029CDSCohen J.G.Huang W.Udalski A.Gould A.Johnson J.A.2010-12-22T15:42:48Z2010-12-08T14:30:41ZCDS support team

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

cds-question@unistra.frchemical-abundancesline-intensitiesgravitational-lensingdwarf-starsWe present an abundance analysis based on high-dispersion and high signal-to-noise ratio Keck spectra of a very highly microlensed Galactic bulge dwarf, OGLE-2007-BLG-349S, with Teff~5400K. The amplification at the time the spectra were taken ranged from 350 to 450. This bulge star is highly enhanced in metallicity with [Fe/H]=+0.51+/-0.09dex. The abundance ratios for the 28 species of 26 elements for which features could be detected in the spectra are almost all solar. In particular, there is no evidence for enhancement of any of the {alpha}-elements, including O and Mg. We conclude that the high [Fe/H] seen in this star, when combined with the equally high [Fe/H] derived in previous detailed abundance analysis of two other Galactic bulge dwarfs, both also highly magnified by microlensing, implies that the median metallicity in the Galactic bulge is very high. We thus infer that many previous estimates of the metallicity distribution in the Galactic bulge have substantially underestimated the mean Fe metallicity there due to sample bias, and suggest a candidate mechanism for such. If our conjecture proves valid, it may be necessary to update the calibrations for the algorithms used by many groups to interpret spectra and broadband photometry of the integrated light of very metal-rich old stellar populations, including luminous elliptical galaxies.2008ApJ...682.1029Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/682/1029CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/682/1029https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/682/1029http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/682/1029https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/682/1029https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/682/1029http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/682/1029GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/682/1029/table1Equivalent widths for OGLE-2007-BLG-349SrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength ({AA})0.1nmem.wlfloatIonSpecies identificationmeta.id;meta.maincharExPotExcitation potentialeVphys.atmol.excitationfloatlog(gf)Log of the oscillator strengthphys.atmol.oscStrengthfloatn_log(gf)[a] inverted solar analysis used to determine gfmeta.notecharl_EW[<= ] Limit flag on EqWidmeta.code.error;spect.line.eqWidthcharEW? Equivalent width in milli-Angstroms1e-13mspect.line.eqWidthfloatnullablen_EW[s] Synthesis used to derive EqWidmeta.notechar