Astrophysical: Planetary nebulae

  • Publication
    The CO structure of NGC 7027 - A bipolar nebula in the making
    Intermediate resolution mapping and limited off-center spectroscopy of the post-main-sequence molecular outflow source NGC 7027 are presented. The CO envelope...
  • Publication
    The computation of interstellar extinction in photoionized nebulae
    Context. The proper plasma analysis practice (PPAP) method has been proposed to analyze spectroscopic data of ionized nebulae. The method is based on a coherent...
  • Publication
    The core-halo structure of IC 418
    Deep spectra of the planetary nebula IC 418 were obtained in the wavelength range 4190-5850 A. The data made it possible to map an extended halo about the...
  • Publication
    The Correlations between Planetary Nebula Morphology and Central Star Evolution: Analysis of the Northern Galactic Sample
    Northern Galactic planetary nebulae (PNs) are studied to disclose possible correlations between the morphology of the nebulae and the evolution of the central...
  • Publication
    The Density, Extinction, and Excitation Characteristics of NGC 6445
    We have acquired [O III] lambda5007, H I lambdalambda6563 and 4861, and [S II] lambdalambda6717 and 6731 imaging of the bipolar outflow source NGC 6445. As a...
  • Publication
    The Density, Extinction, Temperature, and Excitation Structures of NGC 2440
    We have observed the planetary nebula NGC 2440 in the transitions [O II] λ3727, He II λ4686, [O III] λλ(4363+5007), H I λλ(4861+6563), He I λ5876, [N II] λ6584...
  • Talk
    The discovery of a supernova type Ia progenitor at the heart of a planetary nebula
    I will report on the results of our paper published in Nature this week, outlining the discovery of a super-Chandrasekhar double-degenerate binary system at the...
  • Publication
    The Dynamical Evolution of Planetary Nebulae after the Fast Wind
    We explore the dynamics of ionization-bounded planetary nebulae after the termination of the fast stellar wind. When the stellar wind becomes negligible, the...
  • Publication
    The Dynamical Evolution of the Circumstellar Gas around Low- and Intermediate-Mass Stars. I. The Asymptotic Giant Branch
    We have investigated the dynamical interaction of low- and intermediate-mass stars (from 1 to 5 Msolar) with their interstellar medium (ISM). In this first...