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Symbiotic stars with Wolf-Rayet spectra as protoplanetary nebulae?
Astrophysics and Space Science, 1996Symbiotic systems, in particular symbiotic novae, have been suggested to be very early stages of planetary nebulae. Some of them have been described as going through a Wolf-Rayet phase. We argue that there may be a direct relation between symbiotic objects and planetary nebulae, and that the Wolf-Rayet phase is connected to an active spell of the hot ...
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Rossby Wave Propagation and Generation in the Protoplanetary Nebula
Icarus, 1999Abstract The protoplanetary nebular analog to the planetary Rossby wave is developed. Linear dispersion relations are derived. It is found that the nebular Rossby wave propagates freely in the nebular azimuthal direction and slowly grows in the radial direction. Possible ramifications for the nebula are raised for the reverse transition of turbulence
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Hot Molecular Gas in the Protoplanetary Nebula CRL 2688
1990A protoplanetary nebula is the result of the mass loss that occurs as a red giant star evolves into the core of a planetary nebula. The mass loss produces a cool, massive, and slowly expanding envelope around the dying star. Fast and hot winds, emanating from the central star as it approaches the white dwarf stage, overtake and interact with the more ...
M. G. Smith +3 more
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Effects of protoplanetary nebula on orbital dynamics of planetesimals in the outer Solar system
Celestial mechanics & dynamical astronomy, 2019D. Vokrouhlický, D. Nesvorný
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Transient Heating Events in the Protoplanetary Nebula
2006Harold C. Connolly +3 more
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1'' Resolution Mapping of the Molecular Envelope of the Protoplanetary Nebula CRL 618
, 2004C. Sánchez Contreras +4 more
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