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HEAO 1 observations of the X-ray pulsar 4U1626-67Results of an observation of the 7-s pulsar 4U1626-67 with the A2 experiments on HEAO 1 are reported. The phase-averaged X-ray spectra which change radically as a function of pulse phase. Included in this spectral change is the sudden appearance and subsequent decay of a continuum or emission feature with a mean energy of 19 keV which contains about 1/2 the power in this spectral range. Pulse timing results include a new determination of the pulse period and a factor 8 reduction in the upper limit for the light travel time for orbital periods between 1 and 7 hours. The findings for this system are discussed and compared with the general nature of pulsar spectra.
Document ID
19790012775
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Pravdo, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
White, N. 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)
Serlemitsos, P. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Swank, J. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Szymkowiak, A. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tuohy, I. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Garmire, G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1979
Subject Category
Astronomy
Report/Patent Number
NASA-TM-79727
Report Number: NASA-TM-79727
Accession Number
79N20946
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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