Stars lose a significant amount of angular momentum between birth and death, implying that
efficient processes transporting it from the core to the surface are active. Space …

Context. High-precision determinations of abundances of elements in the atmospheres of
the Sun and solar twin stars indicate that the Sun has an unusually low ratio between …

Important insights into the formation and evolution of the Galactic disc (s) are contained in
the chemical compositions of stars. We analysed high-resolution and high signal-to-noise …

Context. We are carrying out a search for planets around a sample of solar twin stars using
the HARPS spectrograph. The goal of this project is to exploit the advantage offered by solar …

Context. In the era of large spectroscopic surveys, massive databases of high-quality spectra
coupled with the products of the Gaia satellite provide tools to outline a new picture of our …

Stellar members of binary systems are formed from the same material, and therefore they
should be chemically identical. However, recent studies have unveiled chemical differences …

Context. In the current era of large spectroscopic surveys of the Milky Way, reference stars
for calibrating astrophysical parameters and chemical abundances are of paramount …

Context. It is well known that the magnetic activity of solar-type stars decreases with age, but
it is widely debated in the literature whether there is a smooth decline or if there is an early …

The lithium present in the photospheres of solar-type stars is transported to the inner parts
by convection, reaching regions even somewhat below the convection zone, by non …

Context. Open clusters are recognised as excellent tracers of Galactic thin-disc properties. At
variance with intermediate-age and old open clusters, for which a significant number of …