Journal: Astrophysical Journal

  • Publication
    Evidence for supersonic downflows in the photosphere of a delta sunspot
    We present polarization profiles observed with the High Altitude Observatory/National Solar Observatory (HAO/NSO) Advanced Stokes Polarimeter (ASP) that...
  • Publication
    Evolutionary versus dynamical time scales for the evolution of the central stars of planetary nebulae
    The disagreement between evolutionary and dynamical time scales for the evolution of the central stars of planetary nebulae (CSPN) through the H-R diagram is...
  • Publication
    Extended nonnuclear infrared emission from Seyfert galaxies
    The IRAS observations of well-known Seyfert galaxies have been studied in comparison with previously published ultraviolet and mid-infrared data. The mid- and...
  • Publication
    Extreme nitrogen enrichment in the asymmetrical planetary nebulae M1-75
    In the framework of the morphological survey of northern sky planetary nebulae, in progress at the IAC we investigate in detail those nebulae that show...
  • Publication
    Forces on magnetic flux tubes moving in inhomogeneous flows
    The back-reaction of an incompressible two-dimensional flow of constant strain to the accelerated motion of a straight cylinder is calculated in the general...
  • Publication
    Gamma-ray observations of the Crab Nebula at TeV energies
    A new series of observation of the Crab Nebula in TeV gamma rays using an improved camera on the Whipple Observatory 10 m Optical Reflector is reported. The...
  • Publication
    Global acoustic oscillations on Alpha Bootis
    A two-week time series of precise radial velocity measurements of Alpha Bootis (Arcturus) covering 7-8 hr per night is reported. The radial barycentric velocity...
  • Publication
    Hidden supernova remnants in the Large Magellanic Cloud H II complex N44
    We have obtained ROSAT PSPC observations of N44, one of the largest H II complexes in the Large Magellanic Cloud. The X-ray emission mostly fails within the...
  • Publication
    Infrared photometry of Seyfert 1.8 and 1.9 galaxies
    Infrared photometry is reported from 1.25 to 10 micrometers for 10 Seyfert 1.8 and 1.9 galaxies identified by Osterbrock and his collaborators and drawn...