Astrofísicas: Composición estelar

  • Publicación
    Li depletion in F stars by internal gravity waves
    It is argued that internal gravity waves generated by the convective envelope of a star may be effective in producing a weak mixing in its radiative interior...
  • Publicación
    Lithium abundances and metallicities in stars near the main-sequence turnoff and a giant in M67
    The iron abundance of seven stars near the main-sequence (MS) turnoff and a giant in M67 are spectroscopically derived, and the results are discussed. The...
  • Publicación
    Lithium abundances in classical and weak T Tauri stars
    A study on the lithium abundance in 36 T Tauri stars (mass range 0.4-2.25 solar masses), partly based on high-dispersion spectra taken with the Isaac Newton...
  • Publicación
    Lithium abundances in metal-deficient dwarfs
    New measurements of the lithium abundance in a sample of 37 field dwarfs of low metallicity (-0.6 ≥ [Fe/H] ≥ 3.2) are presented. Combining these observations...
  • Publicación
    Lithium abundances in samples of dwarf stars of population II and very old population I
    The CCD camera and Intermediate Dispersion Spectrograph of the 2.5 m Issaac Newton Telescope are used to obtain high quality spectra of the 6708-A Li-7...
  • Noticia
    Los exoplanetas rocosos y sus estrellas anfitrionas podrían tener una composición similar
    Las estrellas recién formadas están rodeadas por un disco protoplanetario. Una fracción del material del disco se condensa en bloques formadores de planetas y...
  • Publicación
    MG II observed in the local interstellar medium - The local cloud
    Observations of interstellar absorptions superposed on the chromospheric Mg II emissions of nearby cool stars have been used to explore the structure of the...
  • Publicación
    On the O/Fe versus Fe/H relationship and the progenitors of type I supernovae
    The new observational O/Fe versus Fe/H abundance relationship for halo stars is studied in terms of several models of chemical evolution for the solar...
  • Publicación
    Oxygen abundances in old disc and halo stars of the Galaxy
    Intermediate resolution CCD spectra of the oxygen triplet at 7770 A have been analyzed to determine oxygen abundances in a sample of metal-deficient stars with...