Results 181 to 190 of about 4,999 (221)
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Astrophysics and Space Science, 1994
Hydrodynamical calculations are becoming increasingly successful at understanding the shapes and kinematics of planetary nebulae (PNs). The most successful models are two-dimensional interacting stellar wind models for which the PN nucleus is assumed to originally expel much or most of its mass in an equatorial waistband.
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Hydrodynamical calculations are becoming increasingly successful at understanding the shapes and kinematics of planetary nebulae (PNs). The most successful models are two-dimensional interacting stellar wind models for which the PN nucleus is assumed to originally expel much or most of its mass in an equatorial waistband.
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Synthesis of Organic Compounds in Planetary Nebulae and Proto-Planetary Nebulae
AIP Conference Proceedings, 2006Recent millimeter‐wave and infrared spectroscopic observations have found evidence of rapid synthesis of complex organic molecules in the late stages of stellar evolution. The chemical synthesis begins with the formation of acetylene, the first building block of benzene, in carbon stars.
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Molecules and solids in planetary nebulae and proto-planetary nebulae
Advances in Space Research, 2007Abstract Recent millimeter-wave and infrared spectroscopic observations have identified a large number of organic molecules through their rotational and vibrational transitions. In particular, the detections of the stretching and bending modes of aliphatic and aromatic compounds have revealed a continuous synthesis of organic materials at the late ...
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CO in Planetary Nebulae and Proto-Planetary Nebulae
1997The evolution between the asymptotic giant branch (AGB) and the planetary nebula (PN) phases has long been a “missing link” in our understanding of stellar evolution. Through the study of cool IRAS sources, an increasing number of transition objects, or “proto-planetary nebulae”, has now been identified.
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Astrophysics and Space Science, 1996
This review summarizes spectroscopic and imaging results obtained on board the Infrared Space Observatory (ISO) on well-known planetary nebulae: the young nebula NGC 7027, and two fully evolved nearby nebulae, the Dumbbell and the Helix.
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This review summarizes spectroscopic and imaging results obtained on board the Infrared Space Observatory (ISO) on well-known planetary nebulae: the young nebula NGC 7027, and two fully evolved nearby nebulae, the Dumbbell and the Helix.
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Carbon dust in the evolved born-again planetary nebulae A 30 and A 78
Monthly Notices of the Royal Astronomical Society, 2021J A Toala +2 more
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Planetary nebulae and how to find them: A concise review
Frontiers in Astronomy and Space Sciences, 2022Q A Parker, Parker Quentin A
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