Astrophysical: Population II stars

  • 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
    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...