Astrophysical: Stellar atmospheres

  • Publication
    An implicit integral method to solve selected radiative transfer problems. I - Non-LTE line formation
    In this paper we present a new method to solve those radiative transfer problems where the scattering term in the source function, i.e., the frequency...
  • Publication
    Approximate Lambda-Operators working at optimum convergence rate. I - Theory and application to hydrostatic atmospheres
    In this paper the approximate Lambda-Operator (ALO) developed by Olson, Auer and Buchler (OAB, 1986) is inspected from a more mathematical standpoint and...
  • Publication
    CA II H emission line cores of late-type dwarfs - Variability measurements and velocity field diagnostics
    High-resolution spectra of Alpha Cen B, Xi Boo A, 70 Oph A, and Epsilon Ind obtained using the Coude Echelle Spectrometer and the 1.4-m Coude Auxiliary...
  • Publication
    Carbon abundances and isotope ratios in 70 bright M giants
    Approximate carbon abundances and C-12/C-13 isotope ratios are obtained for 70 M giant stars from intermediate-resolution spectrophotometry of the CO bands near...
  • Publication
    Chemical composition of the solar surface
    The Sun provides a standard reference against which we compare the chemical abundances found anywhere else in the Universe. Nevertheless, there is not a unique...
  • Publication
    Chromospheric MG II H and K emissions free of interstellar contamination - Velocity structure in late-type dwarfs and giants
    The authors have used high resolution IUE spectra from their own studies and from the archive to examine the Mg II h and k chromospheric emission cores of a...
  • Publication
    Chromospheric Modeling of the Active M3V Star G 80–21 with RH1.5D
    This study investigates the active regions of the M3.0V star G 80–21 using the observed data from the CARMENES project with synthetic spectra generated by the...
  • Publication
    Dislocations in Magnetohydrodynamic Waves in a Stellar Atmosphere
    We describe the presence of wave front dislocations in magnetohydrodynamic waves in stratified stellar atmospheres. Scalar dislocations such as edges and...
  • Publication
    Fe I lines in spectra of cool stars: NLTE effects in solar-like atmosphere.
    A detailed NLTE investigation of Fe I lines is carried out for the MACKKL quiet solar atmospheric model using a very realistic iron atomic model. This improved...