Journal: The Astrophysical Journal

  • 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...
  • Publication
    An HST Study of the Supernovae Accompanying GRB 040924 and GRB 041006
    We present the results from a Hubble Space Telescope ACS study of the supernovae (SNe) associated with gamma-ray bursts (GRBs) 040924 (z=0.86) and 041006 (z=0...
  • Publication
    An Hα Nuclear Spiral Structure in the E0 Active Galaxy Arp 102B
    We report the discovery of a two-armed mini-spiral structure within the inner kiloparsec of the E0 LINER/Seyfert 1 galaxy Arp 102B. The arms are observed in Hα...
  • Publication
    An implicit integral method to solve selected radiative transfer problems. 2: LTE stellar atmosphere models
    The implicit intergral method that we have already introduced in a previous paper, together with its application to the non-Local Thermal Equilibrium (non-LTE)...