Astrophysical: Stellar atmospheres

  • Publication
    The mass and helium discrepancy in massive stars: the case Vela X-1.
    A NLTE-analysis is presented of high S/N spectra of the optical component of the standard massive X-ray binary Vela X-1. In combination with the orbital...
  • Publication
    The Second Stellar Spectrum and the non-LTE Problem of the 2nd Kind
    This paper presents an overview of the radiative transfer problem of calculating the spectral line intensity and polarization that emerges from a (generally...
  • Publication
    The Shapes of Stellar Spectra
    Stellar atmospheres separate the hot and dense stellar interiors from the emptiness of space. Radiation escapes from the outermost layers of a star, carrying...
  • Publication
    The use of iteration factors for temperature correction in a stellar atmosphere when convective transport is present
    In a previous work (Paper I of this series), we presented a procedure for computing the temperature distribution in a stellar atmosphere under the constraint of...
  • Publication
    Ultracool Subdwarfs: The Halo Population Down to the Substellar Limit
    Ultracool subdwarfs are low luminosity, late-type M and L dwarfs that exhibit spectroscopic indications of subsolar metallicity and halo kinematics. Their...
  • Talk
    Very Low Mass Stars, Brown Dwarfs and Gas Giant Exoplanets
    Understanding the atmospheric and evolutive properties of very low mass stars, brown dwarfs, and gas giant exoplanets have been important challenges for...