Astrophysical: Planetary nebulae

  • Publication
    Revealing the Mid-Infrared Emission Structure of IRAS 16594-4656 and IRAS 07027-7934
    TIMMI2 diffraction-limited mid-infrared images of a multipolar proto-planetary nebula IRAS 16594-4656 and a young [WC] elliptical planetary nebula IRAS 07027...
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    Rings in the haloes of planetary nebulae
    We present a search for rings or arcs in the haloes of planetary nebulae (PNe). We discovered such structures in eight PNe, tripling the sample of PNe with...
  • Publication
    Rotating Stars and the Formation of Bipolar Planetary Nebulae. II. Tidal Spin-up
    We present new binary stellar evolution models that include the effects of tidal forces, rotation, and magnetic torques with the goal of testing planetary...
  • Publication
    s-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry
    The chemical content of the planetary nebula NGC 3918 is investigated through deep, high-resolution (R ˜ 40 000) UVES (Ultraviolet-Visual Echelle Spectrograph)...
  • Publication
    SALT reveals the barium central star of the planetary nebula Hen 2-39
    Classical barium stars are binary systems which consist of a late-type giant enriched in carbon and slow neutron capture (s-process) elements and an evolved...
  • Publication
    SAO 244567 - A post-AGB star which has turned into a planetary nebula within the last 40 years
    SAO 244567 (Hen 1357 = CPD -59 deg 6926 = IRAS 17119-5926) is an IRAS source with far infrared colors and flux distribution similar to those of planetary...
  • Publication
    SBS 1150+599A: An extremely oxygen-poor planetary nebula in the Galactic halo?
    We report results of a spectrophotometric study of SBS 1150+599A and discuss the nature of this object based upon our data. Our study shows that SBS 1150+599A...
  • Publication
    Search for New Planetary Nebulae with the IPHAS Hα Survey
    The now completed INT photometric H-alpha Survey (IPHAS) is a valuable resource to detect planetary nebulae (PNe) in the Northern Galactic Plane. An area of...
  • Publication
    Searching for emission-line objects in external galaxies
    We are carrying on several surveys in nearby galaxies aiming to find, catalogue and study old and young emission-line objects as H II regions, Planetary Nebulae...