Spectroscopic observations of novae date back a century, and the fundamental nature of the outburst has been understood for 50 years. Yet, recent observations...

Massive stars are generally fast rotators, however, with significant dispersion. We discuss the hypothesis that all OB stars are all born with very similar...

We present the detailed Star Formation History of the nearby Sculptor and Fornax dwarf spheroidal galaxies, from wide-field photometry of resolved stars, going...

Solar-like oscillations in red-giant stars are now commonly detected in thousands of stars with space telescopes such as NASA Kepler mission. Yet, most stars...

I give an overview of our spectroscopic work on the old open cluster M67 and what it may tell us about the origin of the Sun, the existence of terrestrial...

I will review what we know about Type I Bursts (thermonuclear explosions on the surface of accreting Neutron Stars) and burst oscillations (fluctuations in the...

The basis of stellar population modeling was established around 40 years ago somehow optimized to the technical facilities and observational data available at...

A rich zoo of peculiar objects forms when stars with extended, loosely-bound, convective envelopes undergo gravitational interaction with a binary companion. We...

The formation of massive stars is not fully understood. The high luminosity and temperature of massive protostars complicate the accretion mechanism at work in...