489 citations · 5.7k across the 110 of their papers we have counts for
7 papers · 1 filter
Threshing in Action - The tidal disruption of a dwarf galaxy by the Hydra I Cluster
Andreas Koch, Andreas Burkert, R. Michael Rich +4
We report on the discovery of strong tidal features around a dwarf spheroidal galaxy in the Hydra I galaxy cluster, indicating its ongoing tidal disruption. This very low surface b…
4MOST - 4-metre Multi-Object Spectroscopic Telescope
Roelof S. de Jong, Olga Bellido-Tirado, Cristina Chiappini +82
The 4MOST consortium is currently halfway through a Conceptual Design study for ESO with the aim to develop a wide-field (>3 square degree, goal >5 square degree), high-multiplex (…
Precise abundance analysis of the outer halo globular cluster M 75
Nikolay Kacharov, Andreas Koch
Globular clusters (GCs) are the oldest stellar systems in the Milky Way. Long time considered as simple stellar populations, nowadays we recognize their complex star formation hist…
Chemical abundances of metal-poor RR Lyrae stars in the Magellanic Clouds
Raoul Haschke, Eva K. Grebel, Anna Frebel +3
We present for the first time a detailed spectroscopic study of chemical element abundances of metal-poor RR Lyrae stars in the Large and Small Magellanic Cloud (LMC and SMC). Usin…
Small-scale hero: massive-star enrichment in the Hercules dwarf spheroidal
Andreas Koch, Francesca Matteucci, Sofia Feltzing
Dwarf spheroidal galaxies are often conjectured to be the sites of the first stars. The best current contenders for finding the chemical imprints from the enrichment by those massi…
A super-Li rich turnoff star in NGC 6397 - the puzzle persists
Andreas Koch, Karin Lind, Ian B. Thompson +1
This presentation focuses on a recently discovered super-Li rich turnoff star in the old, metal poor globular cluster NGC 6397 (Koch et al. 2011, ApJL, 738, L29). Its unusually hig…