Astrophysical: Population II stars

  • Publication
    Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18‑101000.5
    WISEA J181006.18‑101000.5 (WISE1810) is the nearest metal-poor ultracool dwarf to the Sun. It has a low effective temperature and has been classified as an...
  • Publication
    Heavy-element Abundances in P-rich Stars: A New Site for the s-process?
    The recently discovered phosphorus-rich stars pose a challenge to stellar evolution and nucleosynthesis theory, as none of the existing models can explain their...
  • Publication
    Old-Aged Primary Distance Indicators
    Old-aged stellar distance indicators are present in all Galactic structures (halo, bulge, disk) and in galaxies of all Hubble types and, thus, are immensely...
  • Publication
    Revised Parameter Estimates For The Most Metal-Poor Candidates In SDSS-I And SEGUE
    There are several hundred thousand R = 2000 stellar spectra reported in the final public release of the Sloan Digital Sky Survey (SDSS-I) and the continuing...
  • Publication
    The Lithium-, r- and s-Enhanced Metal-Poor Giant HK-II 17435-00532
    We present the first detailed abundance analysis of the metal-poor giant HK-II 17435-00532. This star was observed as part of the University of Texas Long-Term...
  • Publication
    The R-process Alliance: Fifth Data Release from the Search for R-process-enhanced Metal-poor Stars in the Galactic Halo with the GTC
    Understanding the abundance pattern of metal-poor stars and the production of heavy elements through various nucleosynthesis processes offers crucial insights...
  • Publication
    Updated BaSTI Stellar Evolution Models and Isochrones. II. α-enhanced Calculations
    This is the second paper of a series devoted to presenting an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone...
  • Publication
    Zero-metallicity Hypernova Uncovered by an Ultra-metal-poor Star in the Sculptor Dwarf Spheroidal Galaxy
    Although true metal-free "Population III" stars have so far escaped discovery, their nature, and that of their supernovae, is revealed in the chemical products...