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Magnetic confinement, Alfven wave reflection, and the origins of X-ray and mass-loss 'dividing lines' for late-type giants and supergiantsA simple qualitative model for the origin of the coronal and mass-loss dividing lines separating late-type giants and supergiants with and without hot, X-ray-emitting corona, and with and without significant mass loss is discussed. The basic physical effects considered are the necessity of magnetic confinement for hot coronal material on the surface of such stars and the large reflection efficiency for Alfven waves in cool exponential atmospheres. The model assumes that the magnetic field geometry of these stars changes across the observed 'dividing lines' from being mostly closed on the high effective temperature side to being mostly open on the low effective temperature side.
Document ID
19910050447
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rosner, R.
(Chicago, University IL, United States)
An, C.-H.
(Applied Research, Inc. Huntsville, AL, United States)
Musielak, Z. E.
(Alabama, University Huntsville, United States)
Moore, R. L.
(Chicago Univ. Chicago, IL, United States)
Suess, S. T.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 15, 2013
Publication Date
May 10, 1991
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 372
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A35070
Funding Number(s)
CONTRACT_GRANT: NAS8-36955
Distribution Limits
Public
Copyright
Other

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