Context. Although the number of exoplanets reported in the literature exceeds 5000 so far, only a few dozen of them are young planets (≤900 Myr). However, a...

Numerical simulations of the interstellar medium under the action of a density wave provide an accurate method for determining the positions of the main...

By comparison of different parameters associated with a chaotic evolution, we discuss the relation between several populations of inner Solar System bodies...

Context. Known Mars trojans could be primordial small bodies that have remained in their present-day orbits for the age of the Solar System. Their orbital...

This investigation is based on Hα observations of high spatial resolution. They stem from an enhanced network region near disk centre of the sun and consist of...

Context: Small-scale magnetic fields play an important role in the structure and the dynamics of the solar atmosphere. Aims: This study aims at revealing the...

We present high resolution (λ/Δ λ = 49 000) échelle spectra of the intermediate mass, pre-main sequence stars BF Ori, SV Cep, WW Wul and XY Per. The spectra...

In most papers dealing with random motions and diffusion of small magnetic elements in the photosphere, the convective flows and in particular the granulation...

We present results from numerical simulations of nonlinear MHD dynamo action produced by three-dimensional flows that become turbulent for high values of the...