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Recent observations of Hercules X-1 with HEAO-1 and OSO-8HEAO 1 X-ray observations of Her X-1 near an onset of the high state are discussed. An X-ray light curve is determined which indicates that for about 0.5 day before the X-ray intensity turn-on there was 1.2-sec pulsed emission from the source at a level intermediate between the high- and low-state intensities. These results are taken as demonstrating the stability in the 35-day cycle when compared with previous observations. An inconclusive search for 58-keV line emission from Her X-1 is also reported.
Document ID
19800029225
Document Type
Conference Proceedings
Authors
Pravdo, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Becker, R. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bussard, R. W. (NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md., United States)
Boldt, E. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Holt, S. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Serlemitsos, P. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Swank, J. H. (NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt, Md., United States)
Rothschild, R. E. (California, University San Diego, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
ASTROPHYSICS
Meeting Information
X-ray astronomy(Innsbruck)
Distribution Limits
Public
Copyright
Other