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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 49 650 Abundances of 650 bulge red giant branch stars
See also: J/A+A/486/177 : Bulge field stars from FLAMES-GIRAFFE spectra (Zoccali+, 2008) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
Note (1): Characteristics of our bulge fields: ---------------------------------------------------- N Name GLON GLAT E(B-V) stars ---------------------------------------------------- 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 ----------------------------------------------------
Acknowledgements: Oscar A. Gonzalez, ogonzale(at)eso.org
(End) Oscar A. Gonzalez [ESO], Patricia Vannier [CDS] 29-Apr-2011
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