Journal: Astronomy and Astrophysics

  • Publication
    On the evolutionary status of X-ray selected weak-line T Tauri star candidates in Taurus-Auriga
    We present lithium observations of 35 stars previously reported by Wichmann et al. (1996) to be possible new weak T Tauri stars (WTTS) discovered by ROSAT in...
  • Publication
    On the far infrared bands associated to the vibration of multishell fullerenes
    Multishell fullerenes could be produced in the circumstellar envelopes of rich carbon giants as proposed by Ugarte (1995) and could be carriers of diffuse...
  • Publication
    On the fine structure of sunspot penumbrae. I. A quantitative comparison of two semiempirical models with implications for the Evershed effect
    Sunspot penumbrae exhibit prominent fine structure. Different interpretations of spectropolarimetric observations suggest different, sometimes contradictory...
  • Publication
    On the fine structure of sunspot penumbrae. II. The nature of the Evershed flow
    We investigate the fine structure of the sunspot penumbra by means of a model that allows for a flux tube in horizontal pressure balance with the magnetic...
  • Publication
    On the fine structure of sunspot penumbrae. III. The vertical extension of penumbral filaments
    In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to...
  • Publication
    On the formation of massive stellar clusters
    Here we model a star forming factory in which the continuous creation of stars results in a highly concentrated, massive (globular cluster-like) stellar system...
  • Publication
    On the functional form of the metallicity-giant planet correlation
    Context. It is generally accepted that the presence of a giant planet is strongly dependent on the stellar metallicity. A stellar mass dependence has also been...
  • Publication
    On the importance of the few most massive stars: The ionizing cluster of NGC 588
    We present the results of a double analysis of the ionizing cluster in NGC 588, a giant HII region (GHR) in the outskirts of the nearby galaxy M 33. For this...
  • Publication
    On the interpretation of the optical spectra of L-type dwarfs
    We present synthetic optical spectra in the red and far-red (640-930 nm) of a sample of field L dwarfs suitably selected to cover this new spectral class, and...