Astrophysical: Planetary nebulae

  • Publication
    A hydrodynamical study of multiple-shell planetaries . I. NGC 2438
    We obtained deep imaging and high-resolution spectroscopy of the planetary nebula NGC 2438. In addition to the bright inner rim and the faint halo-like shell...
  • Publication
    A hydrodynamical study of multiple-shell planetary nebulae. III. Expansion properties and internal kinematics: Theory versus observation
    We present the result of a study on the expansion properties and internal kinematics of round/elliptical planetary nebulae of the Milky Way disk, the halo, and...
  • Publication
    A multiwavelength study of LS II+34 26: a hot post-AGB star in the process of becoming a planetary nebula.
    We present the results from a multiwavelength analysis of LS II+34 26, recently identified as a low mass post-AGB star and not a massive population I B-type...
  • Publication
    A near infrared survey of northern planetary nebulae
    We have observed 77 evolved planetary nebulae in the J, H, K, L', and M photometric bands. As a consequence, we note that most PN fall into a range -0.6 (J-H)...
  • Publication
    A new look inside planetary nebula LoTr 5: a long-period binary with hints of a possible third component
    LoTr 5 is a planetary nebula with an unusual long-period binary central star. As far as we know, the pair consists of a rapidly rotating G-type star and a hot...
  • Publication
    A new proto-planetary nebula
    Low and high resolution spectra of IRAS 22568 + 6141 have been obtained. Physical parameters and abundances and flux densities are given for the object. The...
  • Publication
    A new, evolved bipolar planetary nebula.
    Optical imaging and spectroscopy reveal that the ionised region No.252 in the list of Marsalkowa (1974Ap&SS..27....3M), whose photograph is presented in the `...
  • Publication
    A pile of new Planetary Nebulae in the Galactic Plane
    The INT photometric H-alpha Survey (IPHAS; http://www.iphas.org) is now near completion. A band of 10 degrees along the Northern Galactic Plane is being imaged...
  • Publication
    A Precessing Collimated Outflow in the Quadrupolar Planetary Nebula NGC 6881
    We present high-quality (subarcsecond) optical narrowband CCD images of the planetary nebula NGC 6881, which reveal a highly collimated bipolar structure. A...