Keck HIRES Chemical Compositions of Metal-Poor Sgr dSph and Inner Halo Globular Cluster Stars

Details Keck HIRES Chemical Compositions of Metal-Poor Sgr dSph and Inner Halo Globular Cluster Stars Keck HIRES Chemical Compositions of Metal-Poor Sgr dSph and Inner Halo Globular Cluster Stars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517605i&link_type=abstract

American Astronomical Society Meeting 205, #176.05; Bulletin of the American Astronomical Society, Vol. 37, p.380

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Scientific paper

A number of recent studies of metal-rich ([Fe/H] > -1) stars associated with the Sgr dSph have reported abundance differences with respect to those found in MWG stars for many elemental groups: alpha- (e.g., Mg, Si, Ca, Ti), iron-peak, and as well as abundances produced via neutron-capture nucleosynthesis. Some metal-poor outer halo globular clusters have also been purported to be associated with the present-day merger with the Sgr dwarf galaxy. Presented here are stellar abundances for a sample of four globular clusters with [Fe/H] -2. One of these clusters resides in the inner halo of the MWG, the other three are associated with the Sgr dSph. Unlike the unusual abundances reported so for the metal-rich "in situ" Sgr dSph field stars, and the metal-rich globular clusters associated with the Sgr dSph studied so far, these metal-poor clusters possess alpha-element and iron-peak abundances consistent with those observed in metal-poor stars of the MWG. Highlighted here as well are some of the issues involving the environments probed by these extremely useful tracers of early Galactic formation and evolution.
This research has been supported through NASA grant HST-HF-01143.01-A.

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