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Chromospheric Activity in Population II GiantsOne of the mysteries of Population II giants is that they still show chromospheric emission despite their great age. The global dynamo which was active during their main-sequence lifetimes is expected to become extremely weak through magnetic rotational braking. The nature of the observed emission is not understood; although acoustic shock waves might provide the heating, acoustic waves are not predicted to drive the observed mass loss - which in turn requires the dissipation of magneto-hydrodynamic waves. This program was designed to search for the faint stellar H Ly beta emission wings and the fluorescent Fe II and H2 emission from one of the brightest, metal poor, Population II stars. These FUSE diagnostics, when combined with existing UV and optical spectra, help determine the major radiative cooling channels for the chromosphere. This observation was to complement that previously planned for the mildly metal deficient giant alpha Boo (K2 III). However, alpha Boo has yet to be observed with FUSE.
Document ID
20040110224
Acquisition Source
Goddard Space Flight Center
Document Type
Other
Authors
Harper, Graham M.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 21, 2013
Publication Date
August 1, 2004
Subject Category
Astronomy
Report/Patent Number
CU-1535515
Funding Number(s)
CONTRACT_GRANT: NAG5-12210
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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