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±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]⪆-1, suggesting a slow star formation rate. The [ alpha/Fe] of stars having [Fe/H]
Monaco L., Bellazzini M., Bonifacio P., Ferraro F. R., Marconi G., Pancino E., et al. (2005). The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy. I. Chemical abundances of bright RGB stars. ASTRONOMY & ASTROPHYSICS, 441, 141-151 [10.1051/0004-6361:20053333].
The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy. I. Chemical abundances of bright RGB stars
FERRARO, FRANCESCO ROSARIO;
2005
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±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]⪆-1, suggesting a slow star formation rate. The [ alpha/Fe] of stars having [Fe/H]I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
