Building up the Galactic Halo: The Sagittarius dSph and the globular cluster M22

Details Building up the Galactic Halo: The Sagittarius dSph and the globular cluster M22 Building up the Galactic Halo: The Sagittarius dSph and the globular cluster M22

2003-05-07

arxiv.org/abs/astro-ph/0305107v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. LaTeX. To be published in the proceedings of the IV National Workshop on Stellar Astrophysics "Stars in Ga

Scientific paper

The Sagittarius dwarf spheroidal (Sgr) and a few paculiar Galactic Globular Clusters (GGC) can be considered as building blocks of theGalactic Halo. We present a series of results based on a wide field photometry of the Sgr system and the GGC M22. In particular for Sgr we present: (1) the detection of the RGB-bump, a feature that together with the shape of the RGB can be used to constrain the allowed range of age and metallicity and (2) the detection of a clear blue horizontal branch which probes the existance of a metal poor population. In the case of M22 we present clear evidence that differential reddening is the primary cause for the observed spread of the evolutionary sequences.

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