Oral title: Assembling Galactic globular clusters using orbital criteria

Oral abstract: The globular clusters (GCs) are the most ancient stellar systems in the Milky Way. 
Therefore, GCs play a key role in the understanding of the early chemical and dynamical evolution of 
our Galaxy. Around 40 % of GCs are placed within ~ 4 kpc from the Galactic center. In that region, all 
Galactic components overlap, making their disentanglement a challenging task. With Gaia DR2, we 
have accurate absolute proper motions (PMs) for the sample of known GCs that have been 
associated with the bulge/bar region. Combining the PMs with homogeneous distances from RR 
Lyrae and red clump stars, as well as radial velocities from spectroscopy, we can perform an orbital 
analysis of this GC sample, employing a steady Galactic potential with bar. We use a clustering 
algorithm on the orbital parameters such as the perigalactic distance, the apogalactic distance, the 
maximum vertical excursion from the plane and eccentricity to identify the GCs that belong to the 
bulge/bar, thick disk, thin disk or halo.