Astrophysical: Planetary nebulae

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    Physical conditions derived from O II recombination lines in planetary nebulae and their implications
    Based on high quality observations of multiplet V1 of O II and the NLTE atomic computations for O II we study the density and temperature of a sample of PNe. We...
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    Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps
    We determine the physical conditions in NGC 6543, obtaining two different estimates of the electron temperature (T[e]) and one estimate of the electron density...
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    Physical Conditions in the O++ Zone from ISO and HST Data: NGC 6543 Revisited
    We revise the physical conditions in the O++ zone of the planetary nebula NGC 6543, obtaining two different estimates of the electron temperature (Te) and one...
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    Physical Conditions of the Planetary Nebula NGC 5315 Derived from VLT Echelle Observations and the t2 Problem
    Echelle spectrophotometry of the planetary nebula NGC 5315 is presented. The data consist of VLT UVES observations in the 3100-10450 Å range. The intensities of...
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    Physical Structure of Planetary Nebulae. I. The Owl Nebula
    The Owl Nebula is a triple-shell planetary nebula with the outermost shell being a faint bow-shaped halo. We have obtained deep narrowband images and high...
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    Planck intermediate results. XVIII. The millimetre and sub-millimetre emission from planetary nebulae
    Late stages of stellar evolution are characterized by copious mass-loss events whose signature is the formation of circumstellar envelopes (CSE). Planck multi...
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    Planetary Nebula Abundances and Morphology: Probing the Chemical Evolution of the Milky Way
    This paper presents a homogeneous study of abundances in a sample of 79 northern Galactic planetary nebulae (PNe) whose morphological classes have been...
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    Planetary Nebula Candidates in a Region of M33
    Planetary nebulae (PNe) have been used to trace the chemical evolution of galaxies, not only in the Milky Way (Esteban & Peimbert 1995 and references therein)...
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    Planetary nebula candidates in a southern region of M33
    In a search for emission line objects made in a southern region of M 33 using narrow band filters centered on [O III], Hα and adjacent continua, we detect some...