Journal: Astronomy and Astrophysics

  • Publication
    On the nature of transverse coronal waves revealed by wavefront dislocations
    Context. Coronal waves are an important aspect of the dynamics of the plasma in the corona. Wavefront dislocations are topological features of most waves in...
  • Publication
    On the nature of two low-dot{M} X-ray bursters: 1RXS J170854.4-321857 and 1RXS J171824.2-402934
    We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single...
  • Publication
    On the origin of dwarf elliptical galaxies: the fundamental plane
    Context: Early-type dwarf (dE) galaxies are the most common type of galaxies observed in the Universe. Their study has important cosmological implications...
  • Publication
    On the origin of reverse polarity patches found by Hinode in sunspot penumbrae
    Context: The topology of penumbral magnetic fields is poorly known. The satellite Hinode has recently revealed penumbral structures of a magnetic polarity that...
  • Publication
    On the origin of stars with and without planets. Tc trends and clues to Galactic evolution
    We explore a sample of 148 solar-like stars to search for a possible correlation between the slopes of the abundance trends versus condensation temperature...
  • Publication
    On the origin of the γ-ray emission from the flaring blazar PKS 1222+216
    The flat-spectrum radio quasar PKS 1222+216 (4C+21.35, z = 0.432) was detected in the very high energy γ-ray band by MAGIC during a highly active γ-ray phase...
  • Publication
    On the period ratio P1/2P2 in the oscillations of coronal loops
    Aims.With strong evidence of fast and slow magnetoacoustic modes arising in the solar atmosphere there is scope for improved determinations of coronal...
  • Publication
    On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars
    Generally, chemical peculiarity found for stars on the upper main sequence excludes delta Scuti type pulsation (e.g. Ap and Am stars), but for the group of...
  • Publication
    On the physical origin of the second solar spectrum of the Sc II line at 4247 Å
    Context: The peculiar three-peak structure of the linear polarization profile shown in the second solar spectrum by the Ba ii line at 4554 Å has been...