Journal: The Astrophysical Journal

  • Publication
    The C+N+O Abundance of ω Centauri Giant Stars: Implications for the Chemical-enrichment Scenario and the Relative Ages of Different Stellar Populations
    We present a chemical-composition analysis of 77 red-giant stars in Omega Centauri. We have measured abundances for carbon and nitrogen, and combined our...
  • Publication
    The Carbon Star DY Persei May Be a Cool R Coronae Borealis Variable
    Optical and near-IR photometry suggests that the carbon star DY Persei exhibits fadings similar to those of R Coronae Borealis (RCB) variables. Photometric...
  • Publication
    The Carina Project IX: On Hydrogen and Helium Burning Variables
    We present new multiband (UBVI) time-series data of helium burning variables in the Carina dwarf spheroidal galaxy. The current sample includes 92 RR Lyrae—six...
  • Publication
    The Carina Project. VI. The Helium-burning Variable Stars
    We present new optical (BVI) time-series data for the evolved variable stars in the Carina dwarf spheroidal galaxy. The quality of the data and the observing...
  • Publication
    The Carina Project. VII. Toward the Breaking of the Age-Metallicity Degeneracy of Red Giant Branch Stars Using the C U, B, I Index
    We present an analysis of photometric and spectroscopic data of the Carina dSph galaxy, testing a new approach similar to that used to disentangle multiple...
  • Publication
    The Carina Project. X. On the Kinematics of Old and Intermediate-age Stellar Populations1,2
    We present new radial velocity (RV) measurements of old (horizontal branch) and intermediate-age (red clump) stellar tracers in the Carina dwarf spheroidal...
  • Publication
    The Cavity of 3CR 196.1: Hα Emission Spatially Associated with an X-Ray Cavity
    We present a multifrequency analysis of the radio galaxy 3CR 196.1 (z=0.198), associated with the brightest galaxy of the cool-core cluster CIZAJ0815.4-0303...
  • Publication
    The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
    We present high-resolution Hα rotation curves for a sample of 15 dwarf and low surface brightness galaxies. From these we derive limits on the slopes of the...
  • Publication
    The Central Star of NGC 2346 as a Clue to Binary Evolution through the Common Envelope Phase
    We present an analysis of the binary central star of the planetary nebula NGC 2346 based on archival data from the International Ultraviolet Explorer, and new...