Evolution of planetary nebulae. II. Dynamical evolution of elliptical PNs and collimated outflows

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114595· OSTI ID:5425684

Balick, B; Preston, H L; Icke, V

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: Univ. of Washington, Seattle, WA (United States); Leiden Rijksuniversiteit, Sterrewacht (Netherlands)
• OSTI ID: 5425684
• Journal Information: Astron. J.; (United States), Vol. 94
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PLANETARY NEBULAE
GAS FLOW
BALMER LINES
MASS TRANSFER
MORPHOLOGY
SHOCK WAVES
SPECTROPHOTOMETRY
STAR EVOLUTION
STAR MODELS
FLUID FLOW
MATHEMATICAL MODELS
NEBULAE
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources