There are no scheduled talks today.
Converting non-relativistic dark matter to radiation
Dr. Felix Kahlhoefer
Mon, 23 Jul 2018, 16:30
Scattering amplitudes from first principles
Markos Maniatis
Tue, 24 Jul 2018, 10:00
Multi-scale searching machine to detect the cosmic strings network
Seyed Mohammad Sadegh Movahed
Tue, 24 Jul 2018, 11:00

Halo vs. Bulge: a mixed bag of chemical enrichments

Andreas Koch , ARI
The bulge is one of the oldest, yet very metal rich Galactic components suggesting that it experienced early, rapid chemical enrichment. Large spectroscopic surveys are beginning to unearth progressively more metal-poor stars ([Fe/H] < -2 dex) that are predicted to exist in models of galactic evolution, according to which the first stars did form in the bulge. In this talk, I present an overview of such endeavours to detect and characterize such stars. While the chemical abundances of most candidates vastly overlap with those of halo stars, our sample also contains carbon-rich (CEMP) stars -- the first detections of such objects in the bulge. Based on kinematic considerations, I further discuss whether similar claims of metal-poor star detections are true habitants of the bulge or rather halo stars passing through the central regions. As a second, fascinating class of objects, I will then focus on globular clusters and their multiple stellar populations, and their role in the build-up of the Milky Way's halo.
ARI Institute Colloquium
25 Jan 2018, 11:15
ARI Moenchhofstrasse 12-14, Seminarraum 1

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