Journal: Astronomy and Astrophysics

  • Publication
    The new carbon symbiotic star IPHAS J205836.43+503307.2
    Aims: We are performing a search for symbiotic stars using IPHAS, the INT Hα survey of the northern Galactic plane, and follow-up observations. Methods...
  • Publication
    The new orbital elements and properties of ɛ Persei
    A detailed analysis of a large collection of electronic spectra from three observatories, together with radial velocities published earlier, were used to derive...
  • Publication
    The NGC 346 massive star census. Nitrogen abundances for apparently single, narrow lined, hydrogen core burning B-type stars
    Previous analyses of two large spectroscopic surveys of early-type stars in the Large Magellanic Cloud (LMC) have found an excess of nitrogen enriched B-type...
  • Publication
    The NIR Ca ii triplet at low metallicity. Searching for extremely low-metallicity stars in classical dwarf galaxies
    The NIR Ca ii triplet absorption lines have proven to be an important tool for quantitative spectroscopy of individual red giant branch stars in the Local Group...
  • Publication
    The non-LTE line formation of neutral carbon in late-type stars
    Aims.We investigate the non-Local Thermodynamic Equilibrium (non-LTE) line formation of neutral carbon in late-type stars in order to remove some of the...
  • Publication
    The nuclear ring in the unbarred galaxy NGC 278: Result of a minor merger?
    We present fully sampled high angular resolution two-dimensional kinematics in the Hα spectral line, optical and near-infrared imaging, as well as 21 cm atomic...
  • Publication
    The nuclear starburst activity in the Seyfert 2 galaxy NGC 7679
    We present our recent spectrophotometric results of the infrared luminous Seyfert 2 galaxy NGC 7679. We find compelling evidence for the presence of a recent...
  • Publication
    The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
    Context. The nuclear stellar disc (NSD) is, together with the nuclear star cluster (NSC) and the central massive black hole, one of the main components in the...
  • Publication
    The O Vz stars in NGC 346: Distribution, stellar parameters, and insights into low-metallicity effects
    Context. O Vz stars are identified by optical spectra where the He II λ4686 absorption line is more intense than any other He line, suggesting they may be less...