Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-27
Astrophys.J.592:L21-L24,2003; Erratum-ibid.593:L145-L146,2003
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures, accepted for publication in ApJL
Scientific paper
10.1086/378263
The trend of [Mn/Fe] in the Galactic bulge follows the solar-neighborhood relation, but most stars in the Sagittarius dwarf spheroidal galaxy show [Mn/Fe] deficient by approximately 0.2 dex. This leads us to conclude that the Mn yields from both type Ia and type II SNe are metallicity-dependent. Our observations militate against the idea, suggested by Gratton, that Mn is over-produced by type Ia SNe, relative to type II SNe. We predict Mn/Fe ratios, lower than the solar neighborhood relation, for the younger populations of nearly all dwarf galaxies, and that Mn/Fe ratios may be useful for tracing the accretion of low-mass satellites into the Milky Way.
McWilliam Andrew
Rich Robert Michael
Smecker-Hane Tammy Ann
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