Journal: The Astrophysical Journal

  • Publication
    The Trace of the CNO Cycle in the Ring Nebula NGC 6888
    We present new results on the chemical composition of the Galactic ring nebula NGC 6888 surrounding the WN6(h) star WR136. The data are based on deep...
  • Publication
    The Transfer of Resonance Line Polarization with Partial Frequency Redistribution in the General Hanle–Zeeman Regime
    The spectral line polarization encodes a wealth of information about the thermal and magnetic properties of the solar atmosphere. Modeling the Stokes profiles...
  • Publication
    The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
    We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN)...
  • Publication
    The Typical Massive Quiescent Galaxy at z ∼ 3 is a Post-starburst
    We have obtained spectroscopic confirmation with Hubble Space Telescope WFC3/G141 of a first sizeable sample of nine quiescent galaxies at 2.4 < z < 3.3. Their...
  • Publication
    The Ultraviolet Spectrum and Physical Properties of the Mass Donor Star in HD 226868 = Cygnus X-1
    We present an examination of high-resolution, ultraviolet (UV) spectroscopy from Hubble Space Telescope of the photospheric spectrum of the O-supergiant in the...
  • Publication
    The Undiscovered Ultradiffuse Galaxies of the Local Group
    Ultradiffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are...
  • Publication
    The Unrelaxed Dynamical Structure of the Galaxy Cluster Abell 85
    For the first time, we explore the dynamics of the central region of a galaxy cluster within r 500 ∼ 600 h‑1 kpc from its center by combining optical and X-ray...
  • Publication
    The Unusual 2001 Periastron Passage in the ``Clockwork'' Colliding-Wind Binary WR 140
    We follow, using both optical spectroscopy and photometry, the ``textbook'' colliding-wind WR+O binary WR 140 through and between the periastron passages of...
  • Publication
    The Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations
    We present an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library for a solar-scaled heavy element...