The Ital-FLAMES survey of the Sagittarius dwarf Spheroidal galaxy. I. Chemical abundances of bright RGB stars

Abstract

We present iron and $\alpha$ element (Mg, Ca, Ti) abundances for a sample of 15 Red Giant Branch stars belonging to the main body of the Sagittarius dwarf Spheroidal galaxy. Abundances have been obtained from spectra collected using the high resolution spectrograph FLAMES-UVES mounted at the VLT. Stars of our sample have a mean metallicity of [Fe/H]=-0.41$\pm$0.20 with a metal poor tail extending to [Fe/H]=-1.52. The $\alpha$ element abundance ratios are slightly subsolar for metallicities higher than [Fe/H]\gtsima-1, suggesting a slow star formation rate. The [$\alpha$/Fe] of stars having [Fe/H]$<$-1 are compatible to what observed in Milky Way stars of comparable metallicity.

16 pages, 10 figures, 6 tables. Accepted for publication in A&A. Minor changes in the text

References in corpus (7)

• Stellar Chemical Signatures And Hierarchical Galaxy Formation
• Two distinct ancient components in the Sculptor Dwarf Spheroidal Galaxy: First Results from DART
• 'Sculptor'-ing the Galaxy? The Chemical Compositions of Red Giants in the Sculptor Dwarf Spheroidal Galaxy
• Spectroscopy of Red Giants in the LMC Bar: Abundances, Kinematics, and the Age-Metallicity Relation
• Draco 119: A Remarkable Heavy Element-deficient Giant
• The central density cusp of the Sagittarius dwarf spheroidal galaxy
• The distance to the Sgr dwarf spheroidal galaxy from the Red Giant Branch Tip

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