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High dispersion far ultraviolet spectra of cool starsRecent far ultraviolet high dispersion spectra of two cool supergiant stars, Beta Dra (G2 Ib) and Alpha Ori (M2 Iab) are examined in the context of current questions regarding stellar chromospheres, coronae and mass loss. These stars show very different outer atmosphere structure. Beta Dra has a geometrically thin transition region with bright emission lines of 100,000 K plasma that are red-shifted, indicating downflow in magnetic flux tubes. By contrast, Alpha Ori has a cool extended chromosphere and circumstellar envelope with large mass loss.
Document ID
19820023324
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Stencel, R. E. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Linsky, J. L. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Ayres, T. R. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Jordan, C. (Oxford Univ.)
Brown, A. (Oxford Univ.)
Engvold, O. (Oslo Univ.)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.
Subject Category
Astronomy
Accession Number
82N31200
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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