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Chemical characterization of the inner Galactic bulge:North–South symmetry

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While the number of stars in the Galactic bulge with detailed chemical abundance measurements is increasing rapidly, the inner Galactic bulge (|b| +0.6 dex. The Galactic Centre field reveals in… Click to show full abstract

While the number of stars in the Galactic bulge with detailed chemical abundance measurements is increasing rapidly, the inner Galactic bulge (|b| +0.6 dex. The Galactic Centre field reveals in contrast a mainly metal-rich population with a mean metallicity of +0.3 dex. We derived [Mg/Fe] and [Si/Fe] abundances that are consistent with trends from the outer bulge. We confirm for the supersolar metallicity stars the decreasing trend in [Mg/Fe] and [Si/Fe] as expected from chemical evolution models. With the caveat of a relatively small sample, we do not find significant differences in the chemical abundances between the Northern and the Southern fields; hence, the evidence is consistent with symmetry in chemistry between North and South. (Less)

Keywords: north south; inner galactic; chemical; symmetry; galactic bulge; bulge

Journal Title: Monthly Notices of the Royal Astronomical Society
Year Published: 2018

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