Astrophysical: Globular star clusters

  • 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
    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
    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...

  • Publication
    On the Use of Field RR Lyrae as Galactic Probes. V. Optical and Radial Velocity Curve Templates

    We collected the largest spectroscopic catalog of RR Lyrae (RRLs) including ≍20,000 high-, medium-, and low-resolution spectra for ≍10,000 RRLs. We provide the...

  • Publication
    Searching for Tidal Remnants in the Milky Way: Photometric Survey of Globular Clusters

    The picture of building the Milky Way halo from the merger of protogalactic fragments is considered the local manifestation of the hierarchical galaxy formation...

  • Publication
    The Fast X-Ray Transient XRT 210423 and Its Host Galaxy

    Fast X-ray Transients (FXTs) are X-ray flares with durations ranging from a few hundred seconds to a few hours. Possible origins include the tidal disruption of...

  • Publication
    The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion Catalogs and Internal Kinematics

    A number of studies based on the data collected by the Hubble Space Telescope (HST) GO-13297 program "HST Legacy Survey of Galactic Globular Clusters: Shedding...