Astrophysical: Globular star clusters

  • Publication
    A Tale of Two Origins: In Situ versus Accreted Nitrogen-rich Field Stars in the MW
    Spectroscopic surveys have identified significant numbers of metal-poor nitrogen-rich (N-rich) field stars. These stars are strong candidates for escapees from...
  • Publication
    An Unexplained Origin for the Unusual Globular Cluster System in the Ultradiffuse Galaxy FCC 224
    We study the quiescent ultradiffuse galaxy FCC 224 in the Fornax cluster using Hubble Space Telescope (HST) imaging, motivated by peculiar properties of its...
  • News
    Astronomers find a galaxy unchanged since the early universe
    Researchers at the Instituto de Astrofísica de Canarias (IAC) confirm the first detection of a relic galaxy with the Hubble Space Telescope. The results of this...
  • Publication
    Connection between Dwarf Galaxies and Globular Clusters: Insights from the Perseus Cluster Using Subaru Imaging and Keck Spectroscopy
    We present a systematic study of 189 dwarf galaxies and their globular cluster (GC) systems in the Perseus Cluster, based on deep Subaru Hyper Suprime-Cam...
  • Publication
    Eclipsing binaries in the galactic globular cluster Omega Centauri
    We present a photometric survey aimed at the identification of variable stars in the galactic globular cluster ω Cen. Our photometric catalogue is based on ~...
  • Publication
    Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
    Phosphorus-enhanced (P-rich; [P/Fe] ≳ +0.8) giants have been found among mildly metal-poor field stars, but in only one star in a globular cluster (GC), M4 (NGC...
  • Publication
    Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period-Fourier-Metallicity Relations for Fundamental-mode RR Lyrae
    We present newly calibrated period-φ 31-[Fe/H] relations for fundamental-mode RR Lyrae stars in the optical and, for the first time, mid-infrared. This work's...
  • Publication
    Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. II. Period-Fourier-Metallicity Relations for First Overtone RR Lyrae
    We present new period-ϕ 31-[Fe/H] relations for first-overtone RRL stars (RRc), calibrated over a broad range of metallicities (-2.5 ≲ [Fe/H] ≲ 0.0) using the...
  • Publication
    Multiple Populations in Low-mass Globular Clusters: Palomar 13
    Since the discovery of chemically peculiar stars in globular clusters in the last century, the study of multiple populations has become increasingly important...