Spectroscopy of Giants of the Sagittarius Dwarf Galaxy

Details Spectroscopy of Giants of the Sagittarius Dwarf Galaxy Spectroscopy of Giants of the Sagittarius Dwarf Galaxy

1998-12-14

arxiv.org/abs/astro-ph/9812268v1

Astrophys.Space Sci. 265 (1999) 541-544

Astronomy and Astrophysics

Astrophysics

To be published in the proceedings of Galaxy evolution:Connecting the distant Universe with the local fossil record. Paris, Me

Scientific paper

10.1023/A:1002108110445

In this paper we present the first results of the analysis of intermediate resolution ($\Delta\lambda \sim 3.5 \AA$) 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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