Context. Hierarchical triple stars are ideal laboratories for studying the interplay between
orbital dynamics and stellar evolution. Both mass loss from stellar winds and strong …

In this paper we describe a new UV-initiative Hubble Space Telescope project (GO-13297)
that will complement the existing F606W and F814W database of the Advanced Camera for …

Globular star clusters that formed at the same cosmic time may have evolved rather
differently from the dynamical point of view (because that evolution depends on the internal …

Gamma-ray bursts and their afterglows are thought to be produced by an ultra-relativistic jet.
One of the most important open questions is the outflow composition: the energy may be …

Blue stragglers are anomalously luminous core hydrogen-burning stars formed through
mass-transfer in binary/triple systems and stellar collisions. Their physical and evolutionary …

We used an appropriate combination of high-resolution Hubble Space Telescope
observations and wide-field, ground-based data to derive the radial stellar density profiles of …

Omega Centauri is no longer the only globular cluster known to contain multiple stellar
populations, yet it remains the most puzzling. Due to the extreme way in which the multiple …

We introduce an improved code for simulations of star clusters, called mocca. It combines
the Monte Carlo method for star cluster evolution and the fewbody code to perform scattering …

We present new measurements of the centers for 65 Milky Way globular clusters. Centers
were determined by fitting ellipses to the density distribution within the inner 2'of the cluster …

The parameter A+, defined as the area enclosed between the cumulative radial distribution
of blue straggler stars (BSSs) and that of a reference population, is a powerful indicator of …