Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995cub..rept.....a&link_type=abstract
Technical Report, Colorado Univ. Boulder, CO United States Center for Astrophysics and Space Astronomy.
Astronomy and Astrophysics
Astronomy
Extreme Ultraviolet Explorer Satellite, Hertzsprung-Russell Diagram, Stellar Radiation, Coronas, Stellar Spectra, Ultraviolet Spectra, X Rays, Sky Surveys (Astronomy)
Scientific paper
The purpose of the grant was to obtain and analyze data from the EUVE mission: specifically to investigate the 'coronal X-ray deficiency syndrome.' This refers to the fact that late-F/early-G giants in the Hertzsprung gap tend to show high levels of X-ray activity, but curiously depressed relative to their emissions of coronal proxies like C IV (lambda)1549. Later, when such stars have evolved through the red-giant branch to the post-flash 'Clump,' their X-ray levels decline dramatically, but their X-ray/C IV ratios return to 'normal' values. The origin of the dichotomy is thought to bear strongly on the nature of the elusive coronal heating mechanism, and its evolution in time. The observations undertaken here include: ROSAT and ASCA (specifically, 31 Com, a gap star; and beta Cet, an active Clump giant) to probe the high-temperature material; HST/GHRS spectroscopy to measure TZ flows and densities; and EUVE (31 Com observed in AO-1, re-observed in AO-3; beta Cet and v Peg (a gap giant) in AO-2).
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