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Record 1 of 4862
Chromospheric Activity in Population II Giants
Offline Availability: Go to Request Form
Author and Affiliation:
Harper, Graham M.(Colorado Univ., Boulder, CO, United States)
Abstract: One 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.
Publication Date: Aug 01, 2004
Document ID:
20040110224
(Acquired Sep 15, 2004)
Subject Category: ASTRONOMY
Report/Patent Number: CU-1535515
Coverage: Final Report
Document Type: Technical Report
Contract/Grant/Task Num: NAG5-12210
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Colorado Univ.; Boulder, CO, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CHROMOSPHERE; GIANT STARS; POPULATION II STARS; STELLAR ACTIVITY; HYDROGEN; MAGNESIUM; LYMAN ALPHA RADIATION; LYMAN BETA RADIATION
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