Journal: The Astrophysical Journal

  • Publication
    Oxygen Abundances in Nearby FGK Stars and the Galactic Chemical Evolution of the Local Disk and Halo
    Atmospheric parameters and oxygen abundances of 825 nearby FGK stars are derived using high-quality spectra and a non-local thermodynamic equilibrium analysis...
  • Publication
    Oxygen Abundances in Unevolved Metal-poor Stars from Near-Ultraviolet OH Lines
    We have performed a detailed oxygen abundance analysis of 23 metal-poor (-3.0 [Fe/H] -0.3) unevolved halo stars and one giant through the OH bands in the near...
  • Publication
    Oxygen in the Very Early Galaxy
    Oxygen abundances in a sample of ultra-metal-poor subdwarfs have been derived from measurements of the oxygen triplet at 7771-5 Å and OH lines in the near-UV...
  • Publication
    Oxygen Isotopic Ratios in Cool R Coronae Borealis Stars
    We investigate the relationship between R Coronae Borealis (RCB) stars and hydrogen-deficient carbon (HdC) stars by measuring precise 16O/18O ratios for five...
  • Publication
    Panchromatic Observations and Modeling of the HV Tau C Edge-on Disk
    We present new high spatial resolution (lsim0farcs1) 1-5 μm adaptive optics images, interferometric 1.3 mm continuum and 12CO 2-1 maps, and 350 μm, 2.8 and 3.3...
  • Publication
    Parsec-scale Dust Emission from the Polar Region in the Type 2 Nucleus of NGC 424
    Advancements in infrared (IR) interferometry open up the possibility to spatially resolve active galactic nuclei (AGNs) on the parsec-scale level and study the...
  • Publication
    Pattern Speeds of Bars and Spiral Arms from Hα Velocity Fields
    We have applied the Tremaine-Weinberg method to 10 late-type barred spiral galaxies using data cubes, in Hα emission, from the FaNTOmM and GHAFAS Fabry-Perot...
  • Publication
    Peculiar Transverse Velocities of Galaxies from Quasar Microlensing. Tentative Estimate of the Peculiar Velocity Dispersion at z ~ 0.5
    We propose to use the flux variability of lensed quasar images induced by gravitational microlensing to measure the transverse peculiar velocity of lens...
  • Publication
    Peering into the Dark Side: Magnesium Lines Establish a Massive Neutron Star in PSR J2215+5135
    New millisecond pulsars (MSPs) in compact binaries provide a good opportunity to search for the most massive neutron stars. Their main-sequence companion stars...