Keck HIRES Abundances in the Dwarf Spheroidal Galaxy Draco

Details Keck HIRES Abundances in the Dwarf Spheroidal Galaxy Draco Keck HIRES Abundances in the Dwarf Spheroidal Galaxy Draco

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.1888s&link_type=abstract

The Astronomical Journal, Volume 115, Issue 5, pp. 1888-1893.

Astronomy and Astrophysics

Astronomy

61

Galaxies: Abundances, Galaxies: Dwarf, Stars: Abundances

Scientific paper

An analysis of high-resolution Keck HIRES spectra of four giants in the dwarf spheroidal galaxy Draco is presented. We find an unmistakable difference in [Fe/H] among the four stars analyzed, with the range -3.0 < [Fe/H] < -1.5. The abundance ratios are found to be consistent with a Population II sample, although the [Ca/Fe] ratio may be more nearly solar and the [Ba/Fe] ratio exhibits a steeper slope with [Fe/H] than has been found in the Galactic globular clusters or in the Galactic halo field stars. A hint of a deep-mixing pattern is found in one star (D473), suggesting that Draco giants may be more similar to globular cluster giants than they are to the field Population II giants.

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