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Extended observations of Vela X-1 by OSO-8The Goddard Space Flight Center Cosmic X-Ray Experiment aboard OSO-8 viewed the X-ray binary pulsar, Vela X-1, on three occasions from late 1975 through late 1976. The X-ray spectrum is well represented by a power law modified by photoelectric absorption, a high energy cutoff, and a line feature at approximately 6.8 keV. When combined with other observations, our measurements show that the pulse period is not decreasing monotonically. The three eclipses observed all indicate a significant eclipse flux.
Document ID
19780010015
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Becker, R. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rothschild, R. E. (NASA Goddard Space Flight Center Greenbelt, 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)
Pravdo, S. H. (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 Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1977
Subject Category
Astronomy
Report/Patent Number
NASA-TM-78098
Report Number: NASA-TM-78098
Accession Number
78N17958
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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