Astrophysical: Circumstellar matter

  • Publication
    New insights into the outflows from R Aquarii
    Context. The source R Aquarii is a symbiotic binary surrounded by a large and complex nebula with a prominent curved jet. It is one of the closest known...
  • Publication
    New Isolated Planetary-mass Objects and the Stellar and Substellar Mass Function of the σ Orionis Cluster
    We report on our analysis of the VISTA Orion ZY JHKs photometric data (completeness magnitudes of Z = 22.6 and J = 21.0 mag) focusing on a circular area of 2798...
  • Publication
    NGC 6778: strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae
    We present new optical spectra of the nearby, bright, planetary nebula NGC 6778. The nebula has been known to emit strong recombination lines for more than 40...
  • Publication
    On a Rapid Lithium Enrichment and Depletion of K Giant Stars
    A model scenario has recently been introduced by de la Reza and colleagues to explain the presence of very strong Li lines in the spectra of some low-mass K...
  • Publication
    On the alumina dust production in the winds of O-rich asymptotic giant branch stars
    The O-rich asymptotic giant branch (AGB) stars experience strong mass-loss with efficient dust condensation and they are major sources of dust in the...
  • Publication
    On the nature of candidate luminous blue variables in M 33
    Context. Luminous blue variables (LBVs) are a class of highly unstable stars that have been proposed to play a critical role in massive stellar evolution as...
  • Publication
    On the Presence of Metallofullerenes in Fullerene-rich Circumstellar Envelopes
    The presence of neutral C 60 fullerenes in circumstellar environments has been firmly established by astronomical observations as well as laboratory experiments...
  • Publication
    On the simultaneous optical and near-infrared variability of pre-main sequence stars
    For a complete understanding of the physical processes causing the photometric variability of pre-main sequence systems, simultaneous optical and near-IR...
  • Publication
    Optical and Infrared Observations of the Bipolar Proto-Planetary Nebula Henize 401
    Based on optical and near-infrared ground-based spectroscopy and optical and near-infrared Hubble Space Telescope (HST) images, we confirm the classification of...