Astrophysical: Stellar composition

  • Publication
    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...
  • Publication
    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...
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    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...