Guest Speaker: Dr. Cristina Chiappini, Astrophysics Institute Potsdam

Friday, July 26, 2019

The Milky Way Bulge as seen by Gaia DR2 and APOGEEAbstract:

The lack of large samples of stars with spectroscopic information tracing large areas around the Galactic Bulge has been a long-standing missing information piece for Galactic Archaeology studies. This has prevented so far a clearer picture of how the Bulge/bar formed, its connection to the thin disk inside-out grow as well as to a pristine thick disk and halo. In this talk I show how, in the Gaia era, the combination of photometric and spectroscopic surveys is impacting this field, with a particular focus on APOGEE and Gaia DR2. By combining Gaia DR2 parallaxes and optical photometry with other photometric bands from PANSTARRS, 2MASS and AllWISE we derive Bayesian distances and extinctions for stars brighter than G=18 (Anders et al. 2019). Additional information is obtained by using spectroscopic information from APOGEE, and H-band survey that can pier into the dust. This data provide the first opportunity start dissecting the inner-disk/bar/bulge region.  I close this talk with a look into the future, presenting our plans for the 4MOST Milky way Disk And BuLgE Low-Resolution Survey (4MIDABLE-LR), which will be the largest spectroscopic follow-up of the Gaia mission. I close the talk by briefly discussing two opportunities not to be missed by the Galactic Archaeology community in the era of massive spectroscopic follow-up of Gaia, namely: to obtain a large number of red giant stars with seismic information using PLATO, and to extend our knowledge up to now based on red giants to the MS turnoff up to and beyond the Bulge, with multi-object spectroscopy on ELT-MOSAIC.