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Annual Review of Astronomy and Astrophysics

Volume 56, 2018

Chemodynamical History of the Galactic Bulge

Abstract

The Galactic Bulge can uniquely be studied from large samples of individual stars and is therefore of prime importance for understanding the stellar population structure of bulges in general. Here the observational evidence on the kinematics, chemical composition, and ages of Bulge stellar populations based on photometric and spectroscopic data is reviewed. The bulk of Bulge stars are old and span a metallicity range of −1.5≲[Fe/H]≲+0.5. Stellar populations and chemical properties suggest a star-formation timescale below ∼2 Gyr. The overall Bulge is barred and follows cylindrical rotation, and the more metal-rich stars trace a box/peanut (B/P) structure. Dyna-mical models demonstrate the different spatial and orbital distributions of metal-rich and metal-poor stars. We discuss current Bulge-formation scenarios based on dynamical, chemical, chemodynamical, and cosmological models. Despite impressive progress, we do not yet have a successful fully self-consistent chemodynamical Bulge model in the cosmological framework, and we will also need a more extensive chrono-chemical-kinematic 3D map of stars to better constrain such models.

Keyword(s): bar, bulge, chemical composition, chemical evolution, chemodynamical evolution, dynamical evolution, stellar populations
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2018-09-14
2024-12-03
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Chemodynamical History of the Galactic Bulge
Annual Review of Astronomy and Astrophysics 56, 223 (2018); https://doi.org/10.1146/annurev-astro-081817-051826
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