Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-14
Astronomy and Astrophysics
Astrophysics
To be published in the proceedings of `` The Stellar Content of Local Group Galaxies '', held in Cape Town, ed. Patricia White
Scientific paper
The photometric study of the Sagittarius dwarf galaxy by Marconi et al (1998) has suggested the presence of a spread in metallicity (-0.7< [Fe/H] < -1.6), which may result from different bursts of star formation. We present the results from a Multi Object Slit spectroscopy program carried out at the NTT with the aim to determine spectroscopic abundances of Sagittarius giants selected from the CCD photometry. From our intermediate resolution (R about 1500) spectra radial velocities are determined to confirm the membership and metallicities are derived by using spectral synthesis codes for stars down to V about18, i.e. below the RGB clump. Out of 57 observed stars 23 have a radial velocity consistent with Sagittarius membership, here we present results for 8 of these. No star with [Fe/H]<-1.0 is found, three stars are found to be metal-rich.
Bonifacio Piercarlo
Marconi Gianni
Molaro Paolo P.
Pasquini Luca
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