Chemical Elements as Tracers of the Evolution of the Cosmos

WG3 : Multi-D chemical space analysis

Multi-D chemical space analysis - new constraints to GCE The main goal of this project was to carry a chrono-chemo-kinematical map of the Milky Way, i.e., adding information covering larger distances, and adding ages as another dimension (taking advantage of the amazing Gaia DR2 and of the developments in asteroseismology).

Project leads: Cristina Chiappini

Team members: M. Valentini, A. Miglio, J. Montalban, B. Mosser, A. Queiroz, G. Guiglion, F. Anders, I. Minchev



1. Mapping the MW: We were able to produce one of the first extended maps of the the MW using Gaia DR2, by combining Gaia and complementary photometry (Anders et al. 2019, see also, and more recently, spectroscopy (Queiroz et al. 2020a,b - these are involving chemical maps - the first ones close to the galactic mid-plane and extending all the way from the outermost MW parts to the Galactic Bulge). This opens the opportunity to define key sub-samples for further studies and spectroscopic follow up at larger resolution.
2. Future with 4MOST: By exploring the maps available with homogeneous distances and extinctions we are able to see the current cover of the MW and plan for the future extended maps with 4MOST - see the figure of the goal of our 4MIDABLE-LR and how much we plan to extend the MW chemo-kinematical map.
3. Galactic Archaeology with AGES in the disk and AGES for metal poor stars: we do this either by using StarHorse for especially precise samples (e.g. HARPS/Hipparcos  - e.g. Anders et al. 2018), Open Clusters (Casamiquela et al. 2019, Donor et al. 2020) , or asteroseismology (Anders et al. 2017a,b, with CoRoT, Rendle et al. 2019 with K2, Miglio et al. 2020 with Kepler, Valentini al. 2019 with age for metal-poor stars). The advantages of asteroseismology are amazing , as we are able to obtain precise ages even for oldest stars (see Montalban et al. 2020, Miglio et al. 2020). 
Thanks to the work we did in the last couple of years, we have now managed to secure more than 115 hours of UVES observations of seismic targets.