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IUE and Einstein survey of late-type giant and supergiant stars and the dividing lineResults are presented on an IUE UV survey of 255 late-type G, K, and M stars, complementing the Maggio et al. (1990) Einstein X-ray survey of 380 late-type stars. The large data sample of X-ray and UV detections make it possible to examine the activity relationship between the X-ray and the UV emissions. The results confirm previous finding of a trend involving a steeply-dropping upper envelope of the transition region line fluxes, f(line)/f(V), as the dividing line is approached. This suggests that a sharp decrease in maximum activity accompanies the advancing spectral type, with the dividing line corresponding to this steep gradient region. The results confirm the rotation-activity connection for stars in this region of the H-R diagram.
Document ID
19900063619
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Haisch, Bernhard M. (Lockheed Research Laboratories Palo Alto, CA, United States)
Bookbinder, Jay A. (Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Maggio, A. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Vaiana, G. S. (Osservatorio Astronomico Palermo, Italy)
Bennett, Jeffrey O. (Colorado, University Boulder, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 361
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-112
CONTRACT_GRANT: NASA ORDER H-89765-B
Distribution Limits
Public
Copyright
Other