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- W2017496412 abstract "view Abstract Citations (18) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-energy X-ray observations of VELA X-1. Bautz, M. ; Howe, S. ; Gorecki, A. ; Lang, F. ; Levine, A. ; Primini, F. ; Lewin, W. H. G. Abstract Results are presented of observations of Vela X-1 in the 13-180 keV spectral range made with the A-4 instrument on board the HEAO 1 satellite. It is shown that the pulse period, measured during May-December 1978, is consistent with the long-term trend observed between 1975 and 1979. No evidence is detected for gross changes in the shape of the Vela X-1 pulse shape between May 1978 and December 1978, although some details of the 13-20 keV pulse profile seem to have varied during this period. The shape of the pulse profile is found to vary with energy between 13 keV and 70 keV. Pulse-phase-resolved spectroscopy is presented for Vela X-1 in this energy range. In addition, it is found that high energy (13-80 keV) light curves, obtained during each of three 50 day periods in 1977 and 1978, are quite similar to long-term light curves observed at lower energies. Publication: The Astrophysical Journal Pub Date: March 1983 DOI: 10.1086/160827 Bibcode: 1983ApJ...266..794B Keywords: Binary Stars; Eclipsing Binary Stars; Pulsars; X Ray Sources; Energy Spectra; Heao 1; Light Curve; Orbital Elements; Astronomy full text sources ADS | data products SIMBAD (1)" @default.
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- W2017496412 date "1983-03-01" @default.
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- W2017496412 title "High-energy X-ray observations of VELA X-1" @default.
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