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Preface of “Asymmetric Planetary Nebulae 8e”
Galaxies, 2022 Planetary nebulae (PNe) are the progeny of low- and intermediate-mass stars, at the exact time in their late evolution when they eject their hydrogen-rich envelopes and start their transition towards white dwarfs [...]
Martin A. Guerrero +2 more
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On the Age of Galactic Bulge CSPNe: Too Young and Complicated?
Galaxies, 2020 We present preliminary results of our study of a small sample of planetary nebulae in the Galactic Bulge for which high-angular resolution Hubble Space Telescope imaging is available.
Foteini Lykou +2 more
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On the distances of planetary nebulae. [PDF]
The Astronomical Journal, 1971 29 pages, 25 figures, 20 tables, 1 appendix. Submitted to MNRAS; revised to reference Frew et al.
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MULTI-STAGES OPTIMIZED PHOTOIONIZATION MODELLING OF PLANETARY NEBULA LMC SMP-21
Odessa Astronomical Publications, 2012 The new approximation expression for the representation of gas density distribution in planetary nebulae envelopes was proposed. The new multi-stages method for the caclulation of the chemical composition and physical parameters of planetary nebulae ...
B. Ya. Melekh +5 more
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Planetary Nebulae as Sources of Chemical Enrichment of the Galaxy
Frontiers in Astronomy and Space Sciences, 2022 During the late asymptotic giant branch (AGB) phase of stellar evolution, the element carbon is created through the triple-α nuclear reaction. This is followed by the synthesis of other heavy elements via neutron capture in the core and the dredge-up of ...
Sun Kwok, Sun Kwok
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A Dedicated Camera For Extragalactic Planetary Nebulae: The Planetary Nebula Spectrograph [PDF]
Symposium - International Astronomical Union, 1997 Photometry in [OIII] emission of Planetary Nebulae in external galaxies can be used to determine distances as great as that of the Virgo cluster and beyond, as forcefully argued elsewhere during this conference (G.H. Jacoby, invited talk). In addition, measurement of the radial velocities of the PN allows dynamical behaviour to be probed to much ...
Douglas, NG +3 more
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(Sub)mm-Wavelength Observations of Pre-Planetary Nebulae and Young Planetary Nebulae
Galaxies, 2020 This is a non-comprehensive review of observations of pre-Planetary Nebulae (pPNe) and young Planetary Nebulae (yPNe) at (sub)mm-wavelengths, a valuable window for probing multi-phased gas and dust in these objects.
Carmen Sánchez Contreras
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Spherical planetary nebulae [PDF]
Astronomy & Astrophysics, 2002 10 pages + 1 table(ps) and 1 figure(ps); Submitted to ...
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Molecules in planetary nebulae [PDF]
The Astrophysical Journal, 1978 The study of molecules in planetary nebulae is still in its infancy; therefore, it is appropriate both to review existing knowledge and to anticipate developments that will arise as the subject matures. Briefly stated, this subject consists of observations of hydrogen, H2, and carbon monoxide, CO, molecules in a very few nebulae; the tentative ...
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