publication . Article . Preprint . 2005

I. Chemical abundances of bright RGB stars

L. Monaco; M. Bellazzini; P. Bonifacio; F. R. Ferraro; G. Marconi; E. Pancino; L. Sbordone; S. Zaggia;
Closed Access English
  • Published: 13 Sep 2005
  • Country: Italy
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 compara...
Subjects
arXiv: Astrophysics::Galaxy AstrophysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Earth and Planetary Astrophysics
free text keywords: Astrophysics, Space and Planetary Science, Astronomy and Astrophysics, Giant star, Stars, Red-giant branch, Dwarf galaxy, Metallicity, Sagittarius Stream, Dwarf spheroidal galaxy, Milky Way, Physics, Astronomy
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publication . Article . Preprint . 2005

I. Chemical abundances of bright RGB stars

L. Monaco; M. Bellazzini; P. Bonifacio; F. R. Ferraro; G. Marconi; E. Pancino; L. Sbordone; S. Zaggia;