Journal: The Astrophysical Journal

  • Publication
    Ambipolar Diffusion in the Lower Solar Atmosphere: Magnetohydrodynamic Simulations of a Sunspot
    Magnetohydrodynamic (MHD) simulations of the solar atmosphere are often performed under the assumption that the plasma is fully ionized. However, in the lower...
  • Publication
    An Accreting Millisecond Pulsar with Black Hole-like X-Ray Variability: IGR J00291+5934
    IGR J00291+5934 is one of the seven accreting millisecond pulsars (AMPs) discovered so far. We report on the aperiodic timing and color analysis of its X-ray...
  • Publication
    An Effective Temperature Scale for Late-M and L Dwarfs, from Resonance Absorption Lines of Cs I and Rb I
    We present Keck HIRES spectra of six late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures to the objects using detailed atmospheric...
  • Publication
    An Elemental Assay of Very, Extremely, and Ultra-metal-poor Stars
    We present a high-resolution elemental-abundance analysis for a sample of 23 very metal-poor ([Fe/H]
  • Publication
    An Empirical Procedure to Estimate Distances to Stellar Clusters
    A most desirable feature of a standard candle to estimate astronomical distances is robustness against changes in metallicity and age. It is argued that the...
  • Publication
    An Estimation of the Acoustic Cutoff Frequency of the Sun Based on the Properties of the Low-Degree Pseudomodes
    The acoustic cutoff frequency (νac) is an important atmospheric parameter whose estimation has in the past been based on the study of power spectra that have...
  • Publication
    An Extended Lyα Outflow from a Radio Galaxy at z = 3.7?
    Spatially resolved observations of active galactic nuclei (AGN) host galaxies undergoing feedback processes are one of the most relevant avenues through which...
  • Publication
    An Extreme Protocluster of Luminous Dusty Starbursts in the Early Universe
    We report the identification of an extreme protocluster of galaxies in the early universe whose core (nicknamed Distant Red Core, DRC, because of its very red...
  • Publication
    An Hermitian Method for the Solution of Polarized Radiative Transfer Problems
    Spectral synthesis calculations in stellar (magnetized) atmospheres are based on the solution of the radiative transfer equation (RTE) for polarized light. The...