Journal: Astronomy and Astrophysics

  • Publication
    Dynamics of small-scale magnetic fields on the Sun: observations and numerical simulations
    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...
  • Publication
    Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei
    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...
  • Publication
    Dynamics of the solar granulation. III. Fractional diffusion.
    In most papers dealing with random motions and diffusion of small magnetic elements in the photosphere, the convective flows and in particular the granulation...
  • Publication
    Dynamo action in turbulent flows
    We present results from numerical simulations of nonlinear MHD dynamo action produced by three-dimensional flows that become turbulent for high values of the...
  • Publication
    Early detection of the optical counterpart to GRB 980329
    We report optical observations of the GRB 980329 error box which represent the second earliest detection of the GRB 980329 optical transient. We determine R =...
  • Publication
    Early-type dwarf galaxies with multicomponent stellar structure: Are they remnants of disc galaxies strongly transformed by their environment?
    Context. The surface brightness distribution of ~30-40% of the early-type dwarf galaxies with - 18 ≤ MB ≤ -15 in the Virgo and the Coma clusters is fitted by...
  • Publication
    Eclipse of the B3V companion and flaring of emission lines in V838 Monocerotis
    After four years during which only the spectacular light echo was showing continuous and rapid evolution while the central star was nearly constant, in autumn...
  • Publication
    Effect of coronal structure on loop oscillations
    Aims.We investigate the influence of longitudinal structuring of the surrounding corona on the modes of oscillation of a coronal magnetic flux tube. Methods: .A...
  • Publication
    Effect of coronal structure on loop oscillations: exponential profiles
    Aims:The role of longitudinal structuring of the surrounding corona on the modes of oscillation of a coronal magnetic flux tube was studied in Donnelly et al....