Astrophysical: Chemical abundances

  • Publication
    Accurate Metallicities for Very Metal-poor Stars from the Ca II Infrared Triplet
    The Ca II H and K lines are among the few features available to infer the metallicity of extremely metal-poor stars from medium-resolution spectroscopy...
  • News
    An old problem about the measurement of the chemical composition of the universe has been resolved
    Research carried out by a scientific team from the University of Heidelberg (UH), the Instituto de Astrofísica de Canarias (IAC) and the National Autonomous...
  • News
    Astronomers detect large amounts of oxygen in the atmosphere of a primitive star
    Scientists from the Instituto de Astrofísica de Canarias (IAC), in collaboration with the University of Cambridge and the University of California San Diego...
  • Publication
    Atmospheric Parameters and Abundances of Cool Red Giant Stars
    Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to...
  • Publication
    BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)
    Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure...
  • Publication
    Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate
    We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan...
  • Publication
    Chemical Cartography with APOGEE: Two-process Parameters and Residual Abundances for 288,789 Stars from Data Release 17
    Stellar abundance measurements are subject to systematic errors that induce extra scatter and artificial correlations in elemental abundance patterns. We derive...
  • Publication
    Evolution of the Mass-Metallicity Relation from Redshift z ≈ 8 to the Local Universe
    A tight positive correlation between the stellar mass and the gas-phase metallicity of galaxies has been observed at low redshifts. The redshift evolution of...
  • Publication
    On the Pair-instability Supernova Origin of J1010+2358
    The first (Population III) stars formed only out of H and He and were likely more massive than present-day stars. Massive Population III stars in the range 140...