Stellar halos may hold some of the best preserved fossils of the formation history of galaxies.
They are a natural product of the merging processes that probably take place during the …

In this study, we follow up our recent paper (Monteiro et al.) and present a homogeneous
sample of fundamental parameters of open clusters in our Galaxy, entirely based on Gaia …

Context. Open clusters are convenient probes of the structure and history of the Galactic
disk. They are also fundamental to stellar evolution studies. The second Gaia data release …

Positional, structural, and dynamical parameters for all dwarf galaxies in and around the
Local Group are presented, and various aspects of our observational understanding of this …

The spiral structure in the solar neighborhood is an important issue in astronomy. In the past
few years, there has been significant progress in observation. The distances for a large …

Context. The large astrometric and photometric survey performed by the Gaia mission allows
for a panoptic view of the Galactic disc and its stellar cluster population. Hundreds of stellar …

We conduct dissipationless N-body simulations to investigate the cumulative effect of
substructure impacts onto thin disk galaxies in the context of the ΛCDM paradigm. Our …

Aims. We develop a method for membership assignment in stellar clusters using only
photometry and positions. The method is aimed to be unsupervised, data driven, model free …

The structure and evolution of the spiral arms of our Milky Way are basic but long-standing
questions in astronomy. In particular, the lifetime of spiral arms is still a puzzle and has not …

There are two fundamentally different physical origins of faint satellite galaxies:
cosmological substructures that contain shining baryons and the fragmentation of gas-rich …