Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714704f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #147.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present recent high-resolution spectroscopic observations of extremely metal-poor stars located in the ultra-faint dwarf galaxies Ursa Major II, Coma Berenices, Leo IV, Segue 1 and Bootes II. Their chemical abundance patterns resemble those found in halo stars of comparable metallicty, suggesting that chemical evolution was universal, at least in the very low-metallicity regime, before the onset of SN Ia. This chemical similarity lends support to the idea that systems like the surviving dwarfs played a significant role in the assembly of (at least) the metal-poor outer halo of the Galaxy.
Frebel Anna
Kirby Evan N.
Simon Joshua D.
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