Astrophysical: Planetary nebulae

  • Publication
    Excitation and Density Mapping of NGC 3587
    We have acquired narrowband imaging of NGC 3587 (the Owl Nebula) in the transitions [O II] λλ3727, 3729, H I λ4861, [O III] λ5007, H I λ6563, [N II] λ6584, [S...
  • Publication
    Excitation mechanisms of C II optical permitted lines in ionized nebulae
    Context. Carbon is the fourth most abundant element in the universe and its distribution is critical to understanding stellar evolution and nucleosynthesis. In...
  • Publication
    Excitation of emission lines by fluorescence and recombination in IC 418
    We compare calculated intensities of lines of C II, N I, N II, O I and O II with a published deep spectroscopic survey of IC 418. Our calculations use a self...
  • Publication
    Expansion Velocities and Core Masses of Bright Planetary Nebulae in the Virgo Cluster
    The line-of-sight velocities and [O III] 5007 Å expansion velocities are measured for 11 planetary nebulae (PNs) in the Virgo Cluster core, at 15 Mpc distance...
  • Publication
    Extinction Mapping of the Bipolar Outflow NGC 2346
    We have acquired narrowband imaging of NGC 2346 in the transitions H I λ6563 and λ4861 and [O III] λ5007. As a result, we are able to evaluate the variation of...
  • 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
    Faint emission lines in planetary nebulae with a [WC] nucleus
    We present first results from the analysis of a sample of 14 planetary nebulae with [WC] nucleus with detected faint carbon and oxygen recombination lines (RLs)...
  • Publication
    Faint recombination lines in Galactic PNe with a [WC] nucleus
    Aims: We present spatially resolved high-resolution spectrophotometric data for the planetary nebulae PB 8, NGC 2867, and PB 6. We have analyzed two knots in...
  • Publication
    Far- and mid-infrared spectroscopy of complex organic matter of astrochemical interest: coal, heavy petroleum fractions and asphaltenes
    The coexistence of a large variety of molecular species (i.e. aromatic, cycloaliphatic and aliphatic) in several astrophysical environments suggests that...