Tipo de publicación: Con árbitro

  • Publicación
    On the photospheric temperature in small-scale magnetic flux concentrations
    Results are presented of 2D radiative transfer calculations performed for geometric configurations that simulate partly evacuated small-scale magnetic flux...
  • Publicación
    On the physical conditions in AGN optical jets
    The energy budget of all known optical jets is discussed. It is found that to power the extended radio lobes of radio galaxies, the jet bulk motion on kpc...
  • Publicación
    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...
  • Publicación
    On the Possible Existence of Short-Period g-Mode Instabilities Powered by Nuclear-Burning Shells in Post-Asymptotic Giant Branch H-Deficient (PG1159-Type) Stars
    We present a pulsational stability analysis of hot post-asymptotic giant branch (AGB) H-deficient pre-white dwarf stars with active He-burning shells. The...
  • Publicación
    On the possible triple central star system of PN SuWt 2: no ménage à trois at the heart of the Wedding Ring
    SuWt 2 is a planetary nebula consisting of a bright ring-like waist from which protrude faint extended lobes - a morphology believed to be typical of...
  • Publicación
    On the post-common-envelope central star of the planetary nebula NGC 2346
    The common-envelope phase is one of the most poorly understood phases of (binary) stellar evolution, in spite of its importance in the formation of a wide range...
  • Publicación
    On the post-T-Tauri nature of late-type visual companions to B-type stars
    We report on intermediate-to-high resolution spectroscopy and standard broadband photometry of late-type visual companions to early-type stars. Our program...
  • Publicación
    On the potassium-rotation connection in late-type Alpha Persei stars
    We present measurements of the K I λ 7699 line from spectra of 19 late-type members of the αPersei cluster obtained with the Intermediate Dispersion...
  • Publicación
    On the Presence of Metallofullerenes in Fullerene-rich Circumstellar Envelopes
    The presence of neutral C 60 fullerenes in circumstellar environments has been firmly established by astronomical observations as well as laboratory experiments...