Observations of pulsating X-ray binaries 4U0900-40 and 4U1223-62

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Binary Stars, Energy Spectra, Neutron Stars, Stellar Spectra, X Ray Binaries, X Ray Sources, Autocorrelation, Magnetohydrodynamic Flow, Photon Density, Rocket Sounding, Stellar Magnetic Fields, Time Functions

Scientific paper

A sounding-rocket observation of the pulsating X-ray binaries 4U 0900-40 (Vela X-1) and 4U 1223-62 (GX301-2, Wray 977) over the energy range from 0.5 to 27 keV is reported. No short-time-scale periodicities in the range from 2 msec to 20 sec are found for either source, although both exhibit some minor flaring activity on time scales of a few seconds. The data for Vela X-1 suggest that the time-averaged spectra are complex and that the pulse-resolved spectra are also complex and variable, with significant fluctuations above 10 keV. When compared with other observations at different epochs, the spectral data for 4U 1223-62 confirm large variability in both intensity and spectral characteristics. It is concluded that the intrapulse changes observed in the spectral behavior of Vela X-1 must reflect changes in the surface magnetic fields and the plasma flows near the neutron star.

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