Astrophysical: Planetary nebulae

  • Publication
    Subarcsecond knots and filaments in the molecular hydrogen of the bipolar PN NGC 2346
    We present high spatial resolution (~60-90 milliarcseconds) images of the molecular hydrogen emission in the planetary nebula NGC 2346. Molecular hydrogen...
  • Publication
    Temperature fluctuations and the chemical composition of planetary nebulae of Type I.
    The authors present two new methods to determine the electron temperature based on the He I line intensities. The temperatures derived from these methods are...
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    The "Príncipes de Asturias" nebula: a new quadrupolar planetary nebula from the IPHAS survey
    Context: .The Isaac Newton Telescope Photometric Hα Survey (IPHAS) is currently mapping the Northern Galactic plane reaching to r'=20 mag with typically...
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    The alpha -element abundances in the most oxygen-poor planetary nebula PNG 135.9+55.9
    We present extensive new spectroscopy and imaging of PNG 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen...
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    The binary central stars of PNe with the shortest orbital period
    Close binarity can play a significant role in the shaping of planetary nebulae (PNe) as the system evolves through the common-envelope phase. We present the...
  • Publication
    The binary fraction of planetary nebula central stars - III. the promise of VPHAS+
    The majority of planetary nebulae (PNe) are not spherical, and current single-star models cannot adequately explain all the morphologies we observe. This has...
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    The Central Star of NGC 2346 as a Clue to Binary Evolution through the Common Envelope Phase
    We present an analysis of the binary central star of the planetary nebula NGC 2346 based on archival data from the International Ultraviolet Explorer, and new...
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    The Chandra Planetary Nebula Survey (CHANPLANS). II. X-Ray Emission from Compact Planetary Nebulae
    We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (CHANPLANS), the first...
  • Publication
    The Chandra Planetary Nebula Survey (ChanPlaNS). III. X-Ray Emission from the Central Stars of Planetary Nebulae
    We present X-ray spectral analysis of 20 point-like X-ray sources detected in Chandra Planetary Nebula Survey observations of 59 planetary nebulae (PNe) in the...