LIGHT, ALPHA, AND Fe-PEAK ELEMENT ABUNDANCES IN THE GALACTIC BULGE

We present radial velocities and chemical abundances of O, Na, Mg, Al, Si, Ca, Cr, Fe, Co, Ni, and Cu for a sample of 156 red giant branch stars in two Galactic bulge fields centered near (l, b) = (+ 5.25,-3.02) and (0,-12). The (+ 5.25,-3.02) field also includes observations of the bulge globular c...

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Bibliographic Details
Published in:The Astronomical journal 2014-10, Vol.148 (4), p.1-32
Main Authors: Johnson, Christian I, Rich, R Michael, Kobayashi, Chiaki, KUNDER, ANDREA, Koch, Andreas
Format: Article
Language:English
Subjects:
ABSORPTION
Aluminum
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Chromium
COMPARATIVE EVALUATIONS
DISPERSIONS
ELEMENT ABUNDANCE
FLAMES
Galactic bulge
GALAXIES
Magnesium
MASS
METALLICITY
Nickel
NOISE
RADIAL VELOCITY
Red giant stars
RESOLUTION
Silicon
SPECTRA
STARS
Titanium dioxide
TITANIUM OXIDES
VISIBLE RADIATION
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Summary:We present radial velocities and chemical abundances of O, Na, Mg, Al, Si, Ca, Cr, Fe, Co, Ni, and Cu for a sample of 156 red giant branch stars in two Galactic bulge fields centered near (l, b) = (+ 5.25,-3.02) and (0,-12). The (+ 5.25,-3.02) field also includes observations of the bulge globular cluster NGC 6553. However, we only selected a subset of the original observations that included spectra with both high S/N and that did not show strong TiO absorption bands. This work extends previous analysis of this data set beyond Fe and the alpha -elements Mg, Si, Ca, and Ti. For most elements, the NGC 6553 stars exhibit abundance trends nearly identical to comparable metallicity bulge field stars. However, the star-to-star scatter and mean [Na/Fe] ratios appear higher in the cluster, perhaps indicating additional self-enrichment.
ISSN:1538-3881
0004-6256
1538-3881
DOI:10.1088/0004-6256/148/4/67