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High-energy X-ray spectra of Cygnus XR-1 observed from OSO 8X-ray spectra of Cygnus XR-1 were measured with the scintillation spectrometer aboard the OSO 8 satellite during a period of one-and-one-half to three weeks in each of the years from 1975 to 1977. Typical spectra of the source between 15 and 250 keV are presented and the spectra are found to be well represented by a single power-law expression whose photon number spectral index is different for the two intensity states that were considered. The observed pivoting effect is consistent with two-temperature accretion disk models of the X-ray emitting region.
Document ID
19790053788
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dolan, J. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Crannell, C. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dennis, B. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frost, K. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Orwig, L. E. (NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other