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2010ApJ...723.1632N - Astrophys. J., 723, 1632-1650 (2010/November-2)
Chemical enrichment in the faintest galaxies: the carbon and iron abundance spreads in the Bootes I dwarf spheroidal galaxy and the Segue 1 system.
NORRIS J.E., WYSE R.F.G., GILMORE G., YONG D., FREBEL A., WILKINSON M.I., BELOKUROV V. and ZUCKER D.B.
Abstract (from CDS):
For [Fe/H] < -3.0, stars in the Milky Way's dwarf galaxy satellites exhibit a dependence of [C/Fe] on [Fe/H] similar to that in Galactic field halo stars. Thus, chemical evolution proceeded similarly in the formation sites of the Galaxy's extremely metal-poor halo stars and in the ultra-faint dwarf galaxies. We confirm the correlation between (decreasing) luminosity and both (decreasing) mean metallicity and (increasing) abundance dispersion in the Milky Way dwarf galaxies at least as faint as MV= -5. The very low mean iron abundances and the high carbon and iron abundance dispersions in Segue 1 and Boötes I are consistent with highly inhomogeneous chemical evolution starting in near zero-abundance gas. These ultra-faint dwarf galaxies are apparently surviving examples of the very first bound systems.
Abstract Copyright: ∼
Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: individual (BoOtes I, Segue 1) - Galaxy: abundances - stars: abundances
VizieR on-line data: <Available at CDS (J/ApJ/723/1632): table1.dat table2.dat table3.dat table4.dat>
Nomenclature: Table 1: [NWG2010] BooI NNNN N=122 among (Nos 2-1483). Table 2: [NWG2010] Seg1 NNN N=127 among (Nos 1-391).
Simbad objects: 282
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