Results 31 to 40 of about 27,938 (255)
On the Origin of Planetary Nebulae [PDF]
Publications of the Astronomical Society of the Pacific, 1966 [No abstract]
Abell, G. O., Goldreich, P.
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Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula
The Astronomical Journal, 2022 The persistence of planetary systems after their host stars evolve into their post-main-sequence phase is poorly constrained by observations. Many young white dwarf systems exhibit infrared excess emission and/or spectral absorption lines associated with
Jonathan P. Marshall +7 more
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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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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 ...
Kenneth C. Freeman +3 more
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, 2009 We present intermediate resolution long-slit spectra and narrow-band Halpha, [NII] and [OIII] images of PM1-242, PM318 and PM1-333, three IRAS sources classified as possible planetary nebulae.
Acker +25 more
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Three Stages in Evolution of the Object Th4-4
GalaxiesThe results of observations of the object Th4-4 in 1970–2024 showed that during this period the object went through several stages, when its characteristics corresponded to different classes of objects: Be star, symbiotic star and planetary nebula ...
Lyudmila Kondratyeva +5 more
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Discovery of a planetary nebula surrounding the symbiotic star DT Serpentis
, 2013 We report the discovery of a planetary nebula centered on the poorly studied symbiotic binary star DT Ser. In a few other symbiotic stars spatially resolved nebulae have been discovered: however, only one of them might be a genuine planetary nebula ...
Baldinelli, L. +4 more
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Space Telescope Imaging Spectrograph Parallel Observations of the Planetary Nebula M94-20 [PDF]
, 1999 The planetary nebula M94--20 in the Large Magellanic Cloud was serendipitously observed with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope as part of the Hubble Space Telescope Archival Pure Parallel Program.
Morgan D. H. +2 more
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New and Misclassified Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1978 This fourth supplementary list to the CGPN (Perek, Kohoutek, 1967) contains 81 new objects (Table 1) which were published mainly between 1987 and 1990. We did not include as new PN those objects, which are in a transition phase between AGB and PN (no emission lines), and possible post-PN namely objects having central stars on the evolutionary way to WD
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Close Binaries and the Abundance Discrepancy Problem in Planetary Nebulae
Galaxies, 2018 Motivated by the recent establishment of a connection between central star binarity and extreme abundance discrepancies in planetary nebulae, we have carried out a spectroscopic survey targeting planetary nebula with binary central stars and previously ...
R. Wesson +4 more
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