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Chemical compositions of six metal-poor stars in the ultra-faint dwarf spheroidal galaxy Boötes I

2014; EDP Sciences; Volume: 562; Linguagem: Inglês

10.1051/0004-6361/201322796

1432-0746

Miho N. Ishigaki, Wako Aoki, N. Arimoto, Sakurako Okamoto,

Astronomy and Astrophysical Research

Context. Ultra-faint dwarf galaxies recently discovered around the Milky Way (MW) contain extremely metal-poor stars, and might represent the building blocks of low-metallicity components of the MW. Among them, the Boötes I dwarf spheroidal galaxy is of particular interest because of its exclusively old stellar population. Detailed chemical compositions of individual stars in this galaxy are a key to understanding formation and chemical evolution in the oldest galaxies in the Universe and their roles in building up the MW halo.