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Near-resonant excitation and propagation of eccentric density waves by external forcingAn overview is presented of the astronomical evidence that relatively massive, distended, gaseous disks form as a natural by-product of the process of star formation, and also the numerical evidence that SLING-amplified eccentric modes in the outer parts of such disks can drive one-armed spiral density waves in the inner parts by near-resonant excitation and propagation. An ordinary differential equation (ODE) of the second order that approximately governs the nonlocalized forcing of waves in a disk satisfying Lindblad resonance almost everywhere is derived. When transformed and appended with an extra model term, this ODE implies, for free waves, the usual asymptotic results of the WKBJ dispersion relationship and the propagation Goldreich-Tremaine (1978) formula for the resonant torque exerted on a localized Lindblad resonance. An analytical solution is given for the rate of energy and angular momentum transfer by nonlocalized near-resonant forcing in the case when the disk has power-law dependences on the radius of the surface density and temperature.
Document ID
19930030015
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ostriker, Eve C.
(NASA Headquarters Washington, DC United States)
Shu, Frank H.
(California Univ. Berkeley, United States)
Adams, Fred C.
(Michigan Univ. Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 399
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A14012
Funding Number(s)
CONTRACT_GRANT: NSF AST-90-24260
CONTRACT_GRANT: NAGW-2802
Distribution Limits
Public
Copyright
Other

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