Chemical composition of OGLE-2007-BLG-514S Virtual Observatory Resource

Authors
  1. Epstein C.R.
  2. Johnson J.A.
  3. Dong S.
  4. Udalski A.
  5. Gould A.
  6. Becker G.
  7. Published by
    CDS
Abstract

We present a high-resolution spectrum of a microlensed G dwarf in the Galactic bulge with spectroscopic temperature T_eff_=5600+/-180K. This I~21mag star was magnified by a factor ranging from 1160 to 1300 at the time of observation. Its high metallicity ([Fe/H]=0.33+/-0.15dex) places this star at the upper end of the bulge giant metallicity distribution. Using a Kolmogorov-Smirnov test, we find a 1.6% probability that the published microlensed bulge dwarfs share an underlying distribution with bulge giants, properly accounting for a radial bulge metallicity gradient. We obtain abundance measurements for 15 elements and perform a rigorous error analysis that includes covariances between parameters. This star, like bulge giants with the same metallicity, shows no alpha enhancement. It confirms the chemical abundance trends observed in previously analyzed bulge dwarfs. At supersolar metallicities, we observe a discrepancy between bulge giant and bulge dwarf Na abundances.

Keywords
  1. line-intensities
  2. chemical-abundances
  3. gravitational-lensing
  4. g-stars
  5. spectroscopy
  6. milky-way-galaxy
Bibliographic source Bibcode
2010ApJ...709..447E
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/709/447
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/709/447
Document Object Identifer DOI
doi:10.26093/cds/vizier.17090447

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History

2012-03-29T10:52:18Z
Resource record created
2012-03-29T10:52:18Z
Created
2012-04-15T13:33:50Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr