Evolution of planetary nebulae. II. Dynamical evolution of elliptical PNs and collimated outflows
Spatial and kinematic features found in mappings of the velocity of the gas in H-alpha and forbidden N II of the planetary nebulae NGC 40, 2392, 3242, 6543, 6826, 7009, 7354, and 7662 suggest the existence of highly collimated fast outflows characterized by velocities in the 10-60 km/s range. A hydrodynamic mechanism that collimates the gas as it passes outward through a prolate shock front is proposed to explain these observations. The usual fast-wind model is modified under the assumption that the slow-wind envelope that surrounds the star is denser near its equator than near the poles. In the present model, the collimated flow consists of a two-phase gas of cool weakly ionized or neutral knots passing through the surrounding highly ionized material. 35 references.
- Research Organization:
- Washington Univ., Seattle (USA); Leiden Rijksuniversiteit, Sterrewacht (Netherlands)
- OSTI ID:
- 5425684
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 94; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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