Issue |
A&A
Volume 441, Number 1, October I 2005
|
|
---|---|---|
Page(s) | 141 - 151 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20053333 | |
Published online | 13 September 2005 |
The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy
I. Chemical abundances of bright RGB stars
1
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy e-mail: lmonaco@eso.org
2
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Bologna, 40127 Bologna, Italy
3
Università di Bologna – Dipartimento di Astronomia, 40127 Bologna, Italy
4
European Southern Observatory, Casilla 19001, Santiago, Chile
5
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Roma, Italy
6
Università Tor Vergata, Roma, Italy
Received:
28
April
2005
Accepted:
22
June
2005
We present iron and α 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 with a metal-poor tail
extending to [ Fe/H
. The α element abundance ratios are slightly
subsolar for metallicities higher than
, suggesting a slow star
formation rate. The [ α/Fe] of stars having
are compatible to
what observed in Milky Way stars of comparable metallicity.
Key words: stars: atmospheres / Galaxy: abundances / galaxies: evolution / galaxies: dwarf / galaxies: individual: Sgr dSph
© ESO, 2005
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