Spectroscopy of Giants of the Sagittarius Dwarf Galaxy |
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Authors: | P Bonifacio L Pasquini P Molaro G Marconi |
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Institution: | (1) Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy;(2) European Southern Observatory, K. Schwarzschild Strasse 2, D-85748 Garching bei Munchen, Germany;(3) Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy;(4) Osservatorio Astronomico di Roma, Via dell'Osservatorio 2, Monte Porzio Catone, I-00040 Roma, Italy |
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Abstract: | In this paper we present the first results of the analysis of intermediate resolution (Δλ ~ 3.5 Å) spectra of giants of the Sagittarius dwarf galaxy acquired using the ESO NTT telescope. From the deep CCD photometry of Marconi et al. (1998a) we have selected a sample of giants representative of the metallicity spread suggested by the comparison of the colour-magnitude diagram of Sagittarius with those of galactic globular clusters. The spectra have been used to measure radial velocities, to confirm the membership to Sagittarius, and to provide a metallicity estimate by using spectral synthesis techniques. The analyzed stars show a spread in metallicities in the range ?1.0≤ Fe/H]≤ +0.7, some 0.5 dex more metal-rich than the photometric estimates. |
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