Journal: The Astrophysical Journal

  • Publication
    Beyond 31 mag arcsec‑2: The Frontier of Low Surface Brightness Imaging with the Largest Optical Telescopes
    The detection of structures in the sky with optical surface brightnesses fainter than 30 mag arcsec‑2 (3σ in 10 × 10 arcsec boxes; r-band) has remained elusive...
  • Publication
    Beyond the Hubble Deep Field Limiting Magnitude: Faint Galaxy Number Counts from Surface Brightness Fluctuations
    The faint end of the differential galaxy number counts n(m) in the Hubble Deep Field-North (HDF-N) has been determined for the F450W, F606W, and F814W filters...
  • Publication
    Bidimensional Spectroscopic Mapping and Chemical Abundances of the Star-forming Dwarf Galaxy I ZW 18
    We present bidimensional, long-slit spectroscopic mapping of the prototypical low-metallicity dwarf galaxy I Zw 18. A total of eight spaced slit positions were...
  • Publication
    Binarity and the Abundance Discrepancy Problem in Planetary Nebulae
    The discrepancy between abundances computed using optical recombination lines and collisionally excited lines is a major unresolved problem in nebular...
  • Publication
    Black Hole Powered Nebulae and a Case Study of the Ultraluminous X-Ray Source IC 342 X-1
    We present new radio, optical, and X-ray observations of three ultraluminous X-ray sources (ULXs) that are associated with large-scale nebulae. We report the...
  • Publication
    Blue Luminous Stars in Nearby Galaxies: Quantitative Spectral Analysis of M33 B-Type Supergiant Stars
    We present the detailed spectral analysis of a sample of M33 B-type supergiant stars, aimed at the determination of their fundamental parameters and chemical...
  • Publication
    Blue Luminous Stars in Nearby Galaxies—UIT 005: A Possible Link to the Luminous Blue Variable Stage
    A detailed study of the blue supergiant UIT 005 (B2-2.5Ia+) in M 33 is presented. The results of our quantitative spectral analysis indicate that the star is a...
  • Publication
    Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
    We have used multiband high-resolution HST WFPC2 and ACS observations combined with wide-field ground-based observations to study the blue straggler star (BSS)...
  • Publication
    Boron Abundances in Early B Dwarfs of the Galactic Open Cluster NGC 3293
    New boron abundances or upper limits have been determined for eight early B stars in the young Galactic open cluster NGC 3293, using UV spectra obtained by the...