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The distant future of solar activity: A case study of Beta Hydri. III - Transition region, corona, and stellar windThe paper investigates the secular decay of solar-type activity through a detailed comparison of the present sun with the very old solar-type star, Beta Hyi, taken as a proxy of the future sun. Analyses of successive atmospheric layers are presented, with emphasis of the outermost parts. The FUV emission lines for the transition zone are among the faintest so far seen in any solar-type star. The coronal soft X-ray spectrum was measured through different filters on EXOSAT and compared to simulated X-ray observations of the sun seen as a star. The flux from Beta Hyi is weaker than that from the solar corona and has a different spectrum. It is inferred that a thermally driven stellar wind can no longer be supported, which removes the mechanism from further rotational braking of the star through a magnetic stellar wind.
Document ID
19930039989
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dravins, D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Linde, P.
(Lund Observatory Sweden)
Ayres, T. R.
(Colorado Univ. Boulder, United States)
Linsky, J. L.
(Joint Inst. for Lab. Astrophysics; NIST, Quantum Physics Div., Boulder CO, United States)
Monsignori-Fossi, B.
(Arcetri Osservatorio Astrofisico, Florence, Italy)
Simon, T.
(Hawaii Univ. Honolulu, United States)
Wallinder, F.
(Lund Observatory Sweden)
Date Acquired
August 16, 2013
Publication Date
January 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 403
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A23986
Funding Number(s)
CONTRACT_GRANT: NAG5-82
Distribution Limits
Public
Copyright
Other

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