Hard X-ray pulses from 4U 0900-40

Details Hard X-ray pulses from 4U 0900-40 Hard X-ray pulses from 4U 0900-40

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239.1010s&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, Aug. 1, 1980, p. 1010-1016. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

35

Eclipsing Binary Stars, Light Curve, Stellar Mass Accretion, X Ray Sources, Energy Spectra, Neutron Stars, Particle Energy, Periodic Variations

Scientific paper

The 283 s pulsation of 4U 0900-40 (Vela X-1) has been observed at high X-ray energies (not less than 18 keV). Time-averaged light curves with simple double peak structures are detected up to about 70 keV. Individual pulse trains could be observed in the energy range 18-50 keV. Significant pulse-to-pulse variations have been found with respect to pulse intensity. The photon number spectrum can be described by a thermal bremsstrahlung law which has kT about 10 keV for energies above 30 keV but shows a cutoff below this energy. The spectral shape is stable and independent of source intensity during our observations.

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