Lecture Notes in Physics

Models and Constraints

By: Jonathan Ferreira (Editor), Catherine Dougados (Editor), Emma Whelan (Editor)

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Hardcover | 21 August 2007

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244 Pages

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This volume provides an introduction to the astrophysics of jets from young stars. The first half is devoted to general observational constraints, covering the outflow phenomenon in young stars, the identification of magneto-centrifugal processes as the main jet driving mechanism and the magnetic interaction between star and its accretion disc. The second half is devoted to theoretical knowledge of magneto-hydrodynamic processes pertinent to the jet launching mechanism in young stars. This comprises a general introduction to magneto-hydrodynamics, a description of the role of MHD processes in Standard Accretion Discs and the physics of steady state MHD outflows, from the basic concepts and equations to modern self-similar solutions. Further coverage details the various classes of steady magnetic wind models currently discussed in the context of protostellar jets.

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Published: 30th November 2010

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Observational Constraints
The First Three Million Years	p. 3
In the Beginning	p. 3
Molecular Clouds	p. 6
Collapse	p. 10
The Main Accretion Phase	p. 11
The Objects of Joy	p. 13
Outflows	p. 14
Disks Around YSOs	p. 17
References	p. 18
Jets from Young Stars: The Need for MHD Collimation and Acceleration Processes	p. 21
Measurements of Jet Collimation at Various Stages	p. 22
Comparison with HD and MHD Jet Collimation Models	p. 25
Measurements of Jet Energetics: Accretion-ejection Correlations	p. 33
Comparison with HD and MHD Ejection Models	p. 41
General Conclusions	p. 49
References	p. 50
Star-disk Interaction in Classical T Tauri Stars	p. 55
Introduction	p. 55
Classical T Tauri Star Models: Past and Present	p. 56
Magnetic Fields Measurements: Theory vs. Observations	p. 59
Spectral Diagnostics of Magnetospheric Accretion	p. 62
The Future of CTTS Models	p. 68
Conclusions	p. 71
References	p. 71
Magneto-Hydrodynamic Models
Introduction to Magneto-Hydrodynamics	p. 77
What is MHD?	p. 78
Dynamical Equations	p. 79
Ohm's Law	p. 81
Ideal MHD	p. 83
Confinement and Transverse Diffusion of Matter	p. 87
MHD Waves in Homogeneous Plasma	p. 90
Main Applications and "Special Effects"	p. 93
Magnetic Reconnections	p. 94
References	p. 101
Theory and Models of Standard Accretion Disks	p. 103
Introduction	p. 103
Turbulent Angular Momentum Transport in Disks	p. 105
The Magnetorotational Instability	p. 108
Disk Models and Simulations	p. 111
References	p. 114
Theory of MHD Jets and Outflows	p. 117
Introduction	p. 118
MHD Equations	p. 122
The Parker Thermally Driven, Nonrotating Wind	p. 125
Rotating, Magnetized Equatorial Winds	p. 129
Simple Physics in MHD Disk-winds	p. 140
Steady-state, Exact Self-similar MHD Solutions	p. 144
Numerical Simulation of Jet Formation	p. 150
Summary	p. 156
References	p. 157
Transit Flows and Jet Asymptotics	p. 161
Introduction	p. 161
Transit Flows	p. 162
Jet Asymptotics	p. 174
Global Infall-outflow Models	p. 176
Time Dependent Models	p. 178
Conclusion	p. 178
Open Questions	p. 179
References	p. 179
MHD Disc Winds	p. 181
The Accretion-ejection Paradigm	p. 182
Physics of Jet Emitting Discs	p. 187
A Glimpse on Self-similar Solutions	p. 192
Concluding Remarks	p. 198
References	p. 206
Stellar Wind Models	p. 209
Introduction	p. 210
Stellar Jets and Winds	p. 215
Extensions of Stellar Jet Models	p. 219
Conclusions	p. 223
References	p. 223
Index	p. 225
Table of Contents provided by Ingram. All Rights Reserved.

Lecture Notes in Physics

Models and Constraints

At a Glance

Hardcover

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Defective items

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