J/A+A/530/A54 Abundances of 650 bulge red giants (Gonzalez+, 2011)
Alpha element abundances and gradients in the Milky Way bulge from
FLAMES-GIRAFFE spectra of 650 K giants.
Gonzalez O.A., Rejkuba M., Zoccali M., Hill V., Battaglia G., Babusiaux C.,
Minniti D., Barbuy B., Alves-Brito A., Renzini A., Gomez A., Ortolani S.
<Astron. Astrophys. 530, A54 (2011)>
=2011A&A...530A..54G 2011A&A...530A..54G
ADC_Keywords: Stars, giant ; Abundances
Keywords: stars: abundances - stars: late-type - Galaxy: abundances -
Galaxy: bulge - Galaxy: formation
Abstract:
We present the analysis of the [alpha/Fe] abundance ratios for a large
number of stars at several locations in the Milky Way bulge with the
aim of constraining its formation scenario.
We obtained FLAMES-GIRAFFE spectra (R=22500) at the ESO Very Large
Telescope for 650 bulge red giant branch (RGB) stars and performed
spectral synthesis to measure Mg, Ca, Ti, and Si abundances. This
sample is composed of 474 giant stars observed in 3 fields along the
minor axis of the Galactic bulge and at latitudes b=-4°,
b=-6°, b=-12°. Another 176 stars belong to a field containing
the globular cluster NGC 6553, located at b=-3° and 5° away
from the other three fields along the major axis.
Description:
Listed are the [Mg/Fe], [Ca/Fe], [Ti/Fe] and [Si/Fe] abundance ratios
for 650 K giants in four fields of the Galactic Bulge. Abundances were
measured using standard 1D local thermodynamic equilibrium MARCS
models and spectral synthesis using MOOG.
The list also includes the metallicities [Fe/H] presented in Zoccali
et al. (2008, Cat. J/A+A/486/177) and are listed here for reference.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 49 650 Abundances of 650 bulge red giant branch stars
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See also:
J/A+A/486/177 : Bulge field stars from FLAMES-GIRAFFE spectra (Zoccali+, 2008)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name, as in Zoccali et al., 2008,
Cat. J/A+A/486/177
10- 14 F5.2 [Sun] [Fe/H] Abundance ratio, Fe/H
17- 21 F5.2 [Sun] [Mg/Fe] Abundance ratio, Mg/Fe
25- 29 F5.2 [Sun] [Ca/Fe] Abundance ratio, Ca/Fe
33- 37 F5.2 [Sun] [Ti/Fe] Abundance ratio, Ti/Fe
41- 45 F5.2 [Sun] [Si/Fe] Abundance ratio, Si/Fe
49 I1 --- Field [1/4] Field name (1)
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Note (1): Characteristics of our bulge fields:
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N Name GLON GLAT E(B-V) stars
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1 Baade's Window 1.14 -4.18 0.55 194
2 b=-6° 0.21 -6.02 0.48 194
3 Blanco field 0.00 -12.0 0.20 86
4 NGC 6553 5.25 -3.02 0.70 176
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Acknowledgements:
Oscar A. Gonzalez, ogonzale(at)eso.org
(End) Oscar A. Gonzalez [ESO], Patricia Vannier [CDS] 29-Apr-2011