Astrophysical: Planetary nebulae

  • Publication
    A search for diffuse bands in fullerene planetary nebulae: evidence of diffuse circumstellar bands
    Large fullerenes and fullerene-based molecules have been proposed as carriers of diffuse interstellar bands (DIBs). The recent detection of the most common...
  • Publication
    A search for hydrogenated fullerenes in fullerene-containing planetary nebulae
    Detections of C60 and C70 fullerenes in planetary nebulae (PNe) of the Magellanic Clouds and of our own Galaxy have raised the idea that other forms of carbon...
  • Publication
    A search for magnetic fields on central stars in planetary nebulae
    Context. One of the possible mechanisms responsible for the panoply of shapes in planetary nebulae is the presence of magnetic fields that drive the ejection of...
  • Publication
    A Search for near Infrared Bands of the Fullerene Cation C_{60}^+ in the Protoplanetary Nebula IRAS 01005+7910
    IRAS 01005+7910 is a carbon-rich protoplanetary nebula with a recently reported detection of mid-IR vibrational transitions of the fullerene C60 by Zhang and...
  • Publication
    A search for new objects in the transition phase between AGB-stars and planetary nebulae
    Preliminary results are presented from a spectroscopy survey of IRAS sources with colors similar to those of planetary nebulae. Two new planetary nebulae, some...
  • Publication
    A search for planetary nebulae in M33
    We searched for planetary nebulae (PNe) in the nearby spiral galaxy M33 using the Wide Field Camera at the 2.54 m Isaac Newton Telescope of La Palma (Spain)...
  • Publication
    A spectroscopic atlas of post-AGB stars and planetary nebulae selected from the IRAS point source catalogue
    Aims.We study the optical spectral properties of a sample of stars showing far infrared colours similar to those of well-known planetary nebulae. The large...
  • Publication
    A spectroscopic atlas of post-AGB stars and planetary nebulae selected from the IRAS point source catalogue.
    The spectroscopic observations were conducted during several runs spanning 15 years from March 1988 to June 2003. The observations from the Southern Hemisphere...
  • Publication
    A stronger He II 4686 in the spectrum of the planetary nebula NGC 6572
    On a recent spectrogram of the planetary nebula NGC 6572 the authors have found He II 4686 clearly in emission. They review previous descriptions of the...