High-resolution spectrum of OGLE-2006-BLG-265 Virtual Observatory Resource

Authors
  1. Johnson J.A.
  2. Gal-Yam A.
  3. Leonard D.C.
  4. Simon J.D.
  5. Udalski A.
  6. Gould A.
  7. Published by
    CDS
Abstract

We present an R=45000 Keck spectrum of the microlensed Galactic bulge G dwarf OGLE-2006-BLG-265, which has high (~60) signal-to-noise ratio despite its short (15 minute) exposure time, because the source was magnified by A~135. While it is very metal-rich ([Fe/H]=0.56), the higher temperature of this star compared with the luminous red giants usually measured in the bulge gives its spectrum many unblended atomic lines. We measure the abundances of 17 elements, including the first abundances for S and Cu in a bulge star. The [alpha/Fe] ratios are subsolar, while the odd-Z elements are slightly supersolar, trends that are also seen in the more metal-rich stars in the bulge and the local Galactic disk. Because the star is a dwarf, the [O/Fe], [Na/Fe], and [Al/Fe] ratios cannot be attributed to internal mixing, as is sometimes claimed for giants. Similar high-resolution spectra could be obtained for about a dozen bulge dwarf stars per year by means of well-designed target-of-opportunity observations.

Keywords
  1. dwarf-stars
  2. spectroscopy
Bibliographic source Bibcode
2007ApJ...655L..33J
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/655/L33
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/655/L33
Document Object Identifer DOI
doi:10.26093/cds/vizier.16559033

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History

2009-01-31T16:19:13Z
Resource record created
2009-01-31T15:23:46Z
Updated
2009-01-31T16:19:13Z
Created

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