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X-ray observations of AM Herculis from OSO 8X-ray observations of the white dwarf binary system AM Herculis in the range 2 to 250 keV, taken by OSO 8, are presented and compared with balloon and Ariel 5 measurements. The composite spectrum of the 2 to 40 and 20 to 250 keV fluxes determined by the proportional counter and the high energy scintillation spectrometer, respectively, on board the satellite is shown averaged over the entire binary cycle. Variations in spectral shape and intensity between the OSO 8 results and balloon measurements taken 10 to 20 days apart are observed. Results indicate the presence of a spectral break at about 15 keV on some occasions, similar to that seen in Her X-1, however presumably caused by a different mechanism than in the neutron star. It is also considered unlikely that the gamma-ray tail observed by Ariel 5 existed during OSO 8 observations.
Document ID
19790054505
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Coe, M. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dennis, B. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dolan, J. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Crannell, C. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frost, K. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Orwig, I. E. (NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
June 7, 1979
Publication Information
Publication: Nature
Volume: 279
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other