J/ApJ/699/66ivo://CDS.VizieR/J/ApJ/699/66doi:10.26093/cds/vizier.16990066CDSCohen J.G.Thompson I.B.Sumi T.Bond I.Gould A.Johnson J.A.,Huang W.Burley G.2011-10-14T14:27:09Z2011-09-21T11:47:03ZCDS support team

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

cds-question@unistra.frchemical-abundancesline-intensitiesgravitational-lensingdwarf-starsWe present abundance analyses based on high dispersion and high signal-to-noise ratio Magellan spectra of two highly microlensed Galactic bulge stars in the region of the main-sequence turnoff with T_eff_~5650K. We find that MOA-2008-BLG-310S has [Fe/H]^8^=+0.41+/-0.09dex and MOA-2008-BLG-311S has +0.26+/-0.09dex. The abundance ratios for the ~20 elements for which features could be detected in the spectra of each of the two stars follow the trends with [Fe/H] found among samples of bulge giants. Combining these two bulge dwarfs with the results from previous abundance analysis of four other Galactic bulge turnoff region stars, all highly magnified by microlensing, gives a mean [Fe/H] of +0.29dex. This implies that there is an inconsistency between the Fe-metallicity distribution of the microlensed bulge dwarfs and that derived by the many previous estimates based on surveys of cool, luminous bulge giants, which have mean [Fe/H]~-0.1dex.2009ApJ...699...66Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/699/66CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010)J/A+A/499/737 : Abundances of microlensed dwarf and subgiant stars (Bensby+,J/ApJ/682/1029 : Abundances in OGLE-2007-BLG-349S (Cohen+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/699/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/699/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/699/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/699/66https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/699/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/699/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/699/66/table4W_{lambda}_ for the sample extremely metal-poor (EMP) stars from the Hamburg/ESO Survey (HES)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar designation (MOA-2008-BLG-310S or MOA-2008-BLG-311S)meta.id;meta.maincharlambdaWavelength in Angstroms0.1nmem.wlfloatIonSpecies identificationmeta.idcharExPotExcitation potentialeVphys.atmol.excitationfloatlog(gf)Log of the oscillator strengthphys.atmol.oscStrengthfloatEW? Equivalent width in milli-Angstroms0.1pmspect.line.eqWidthfloatnullable