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Chromospheric Heating in Late-Type Stars: Evidence for Magnetic and Nonmagnetic Surface StructureThe aim of this paper is to evaluate recent observational and theoretical results concerning the physics of chromospheric heating as inferred from IUE, HST-GHRS and ROSAT data. These results are discussed in conjunction with theoretical model calculations based on acoustic and magnetic heating to infer some conclusions about the magnetic and non-magnetic surface structure of cool luminous stars. I find that most types of stars may exhibit both magnetic and nonmagnetic structures. Candidates for pure nonmagnetic surface structure include M-type giants and super-giants. M-type supergiants are also ideal candidates for identifying direct links between the appearance of hot spots on the stellar surface (perhaps caused by large convective bubbles) and temporarily increased chromospheric heating and emission.
Document ID
19970021269
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Cuntz, Manfred (Colorado Univ. Boulder, CO United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Stellar Surface Structure
Publisher: IAU
Subject Category
Astrophysics
Report/Patent Number
NASA-CR-204602
NAS 1.26:204602
Accession Number
97N22285
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: AR-5285.02-93A
Distribution Limits
Public
Copyright
Public Use Permitted.

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