Astrofísicas: Nebulosas planetarias

  • Publicación
    Observational Confirmation of a Link Between Common Envelope Binary Interaction and Planetary Nebula Shaping
    A current issue in the study of planetary nebulae with close binary central stars (CSs) is the extent to which the binaries affect the shaping of the nebulae...
  • Publicación
    On central star luminosities and optical thicknesses in planetary nebulae
    Results of an investigation of 23 planetary nebulae whose post-AGB central stars have been previously analyzed using direct spectroscopic non-LTE methods are...
  • Publicación
    On the Chemical Abundances of Multiple-Shell Planetary Nebulae with Halos
    We present narrowband imagery and long-slit intermediate-resolution spectroscopy of the multiple-shell planetary nebulae NGC 2438 and NGC 5882. A comparative...
  • Publicación
    On the Detectability of Post-common-envelope Binary Central Stars of Planetary Nebulae
    Common envelope evolution is widely accepted as the principal shaping agent in the formation of aspherical planetary nebulae. However, only some 20% of...
  • Publicación
    On The Kinematics of Multiple-Shell Planetary Nebulae. I. Data and Expansion Velocities
    We present spatially resolved echelle spectroscopy, obtained at high spectral resolution, for 15 multiple-shell planetary nebulae. Most exhibit faint detached...
  • Publicación
    On the most luminous planetary nebulae of M 31
    Context. The planetary nebula luminosity function (PNLF) is a standard candle that comprises a key rung on the extragalactic distance ladder. The method is...
  • Publicación
    On the nitrogen abundance of fast, low-ionization emission regions: the outer knots of the planetary nebula NGC 7009
    We have constructed a 3D photoionization model of a planetary nebula (PN) similar in structure to NGC 7009 with its outer pair of knots (also known as FLIERs -...
  • Publicación
    On the possible triple central star system of PN SuWt 2: no ménage à trois at the heart of the Wedding Ring
    SuWt 2 is a planetary nebula consisting of a bright ring-like waist from which protrude faint extended lobes - a morphology believed to be typical of...
  • Publicación
    On the post-common-envelope central star of the planetary nebula NGC 2346
    The common-envelope phase is one of the most poorly understood phases of (binary) stellar evolution, in spite of its importance in the formation of a wide range...