Astrofísicas: Composición estelar

  • Publicación
    Oxygen abundances in unevolved metal-poor stars - Interpretation and consequences
    The oxygen abundance has been determined by analysis of the O I infrared triplet in 30 unevolved field stars of metallicities in the range Fe/H abundance ratio...
  • Publicación
    Relative lithium abundances in pre-main-sequence spectroscopic binaries
    We present a study of the lithium abundance of five pre-main sequence (PMS) double-lined binaries. These binaries are composed of weak-lined T Tauri stars...
  • Publicación
    The influence of internal gravity waves on the light elements depletion among F-type stars
    It is proposed that the Li abundances in F-type stars can be affected by the weak mixing generated by internal gravity waves since the absence of Li is so...
  • Publicación
    The lithium abundance in the extremely metal-deficient dwarf G 64-12
    The authors have measured the 7Li abundance in G 64-12 an extremely metal-deficient dwarf [Fe/H] = -3.5 (Carney and Peterson, 1981) with effective temperature...
  • Publicación
    The lithium resonance line in T Tauri stars
    High-resolution spectra provide evidence of the Li-I 6707 line in 28 of the stars, and the significance of the results is discussed. The Li-I equivalent widths...
  • Publicación
    Why are Massive O-rich AGB Stars in our Galaxy not S-stars?
    We present the main results derived from a chemical analysis carried out on a large sample of galactic O-rich AGB stars using high resolution optical...