High-energy X-ray observations of VELA X-1

Details High-energy X-ray observations of VELA X-1 High-energy X-ray observations of VELA X-1

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..794b&link_type=abstract

Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 794-805.

Astronomy and Astrophysics

Astrophysics

15

Binary Stars, Eclipsing Binary Stars, Pulsars, X Ray Sources, Energy Spectra, Heao 1, Light Curve, Orbital Elements

Scientific paper

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.

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