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
    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
    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
    Open Cluster Chemical Homogeneity throughout the Milky Way

    The chemical homogeneity of surviving stellar clusters contains important clues about interstellar medium (ISM) mixing efficiency, star formation, and the...

  • Publication
    Orbital Torus Imaging: Using Element Abundances to Map Orbits and Mass in the Milky Way

    Many approaches to galaxy dynamics assume that the gravitational potential is simple and the distribution function is time invariant. Under these assumptions...

  • Publication
    Photoionized Herbig-Haro Objects in the Orion Nebula through Deep High Spectral Resolution Spectroscopy. II. HH 204

    We analyze the physical conditions, chemical composition, and other properties of the photoionized Herbig-Haro (HH) object HH 204 through Very Large Telescope...

  • Publication
    Physical Parameters of SDSS Stars, the Nature of the SDSS `Ring around the Galaxy', and the SEGUE Project

    Although the Sloan Digital Sky Survey (SDSS) was primarily envisioned as a tool for understanding the nature of the `high redshift' universe, significant...