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Title:
The collimation of magnetized winds
Authors:
Heyvaerts, Jean; Norman, Colin
Affiliation:
AA(Paris VII, Universite, France), AB(Johns Hopkins University; Space Telescope Science Institute, Baltimore, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 1055-1081. (ApJ Homepage)
Publication Date:
12/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Asymptotic Methods, Early Stars, Magnetic Effects, Magnetohydrodynamic Flow, Stellar Winds, Boundary Conditions, Boundary Value Problems, Collimation, Pulsars, Solar Wind
DOI:
10.1086/168195
Bibliographic Code:
1989ApJ...347.1055H

Abstract

It is established that any stationary axisymmetric magnetized wind will collimate along the symmetry axis at large distances from the source. This result is proved by consideration of the asymoptotic properties of the transfield equation, keeping the exact conserved quantities along field lines. The only consistent nonsingular solution with a nonvanishing poloidal current approaches a cylindrical structure. For singular solutions or those with a vanishing poloidal current, the asymptotic solutions can be paraboloidal. This result only applies to pure wind boundary conditions on the surface of the source. It is shown how the boundary conditions and the critical point analysis are related in our asymptotic analysis. This result demonstrates that axisymmetric magnetized flows tend generally to collimate, and it is hypothesized that this is the natural reason why there are so many collimated flows and jets.

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