The Abundance Spread in the Boötes I Dwarf Spheroidal Galaxy

Details The Abundance Spread in the Boötes I Dwarf Spheroidal Galaxy The Abundance Spread in the Boötes I Dwarf Spheroidal Galaxy

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...689l.113n&link_type=abstract

The Astrophysical Journal, Volume 689, Issue 2, pp. L113-L116.

Astronomy and Astrophysics

Astronomy

37

Galaxies: Abundances, Galaxies: Dwarf, Galaxies: Individual (Boötes I)

Scientific paper

We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Boötes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca II K line. Assuming [Ca/Fe] ~ 0.3, the abundance range in the sample is Δ[Fe/H] ~ 1.7 dex, with one star having [Fe/H] = -3.4. The dispersion is σ([Fe/H]) = 0.45 +/- 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (>~107 Msolar) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

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