Journal: The Astrophysical Journal

  • Publication
    A Tidal Extension in the Ursa Minor Dwarf Spheroidal Galaxy
    We report the detection of main-sequence and blue horizontal-branch stars of the Ursa Minor dwarf spheroidal galaxy beyond its tidal radius, indicating the...
  • Publication
    A Time-dependent Semiempirical Model of the Chromospheric Umbral Oscillation
    We present a time-dependent semiempirical model of the chromospheric umbral oscillation in sunspots. This model has been obtained by applying recently developed...
  • Publication
    A Triple Main Sequence in the Globular Cluster NGC 2808
    Accurate photometry with HST's ACS shows that the main sequence (MS) of the globular cluster NGC 2808 splits into three separate branches. The three MS branches...
  • Publication
    A Two Micron All Sky Survey View of the Sagittarius Dwarf Galaxy. VI. s-Process and Titanium Abundance Variations Along the Sagittarius Stream
    We present high-resolution spectroscopic measurements of the abundances of the α element titanium (Ti) and s-process elements yttrium (Y) and lanthanum (La) for...
  • Publication
    A Uniform Asteroseismic Analysis of 22 Solar-type Stars Observed by Kepler
    Asteroseismology with the Kepler space telescope is providing not only an improved characterization of exoplanets and their host stars, but also a new window on...
  • Publication
    A WFC3/HST View of the Three Stellar Populations in the Globular Cluster NGC 6752
    Multi-band Hubble Space Telescope photometry reveals that the main sequence, sub-giant, and the red-giant branch of the globular cluster NGC 6752 splits into...
  • Publication
    A White Dwarf with Transiting Circumstellar Material Far outside the Roche Limit
    We report the discovery of a white dwarf exhibiting deep, irregularly shaped transits, indicative of circumstellar planetary debris. Using Zwicky Transient...
  • Publication
    A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571
    We report on the results of optical, near-infrared (NIR), and mid-infrared observations of the black hole X-ray binary candidate (BHB) MAXI J1535–571 during its...
  • Publication
    About Metallicity Variations in the Local Galactic Interstellar Medium
    In this paper we discuss and confront recent results on metallicity variations in the local interstellar medium, obtained from observations of H II regions and...