High energy X-ray observations of the 38-second pulsar

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Pulsars, X Ray Sources, Heao 1, Position (Location), Pulse Duration, Spaceborne Astronomy, Stellar Spectra

Scientific paper

The results of observations of the 38-second pulsar obtained at high X-ray energies (13-180 keV) with the UCSD/MIT instrument aboard HEAO 1 are reported. The results include a measurement of the source location, measurement of the pulse profile, and determination of the average intensity and spectrum during each of three time intervals spanning a baseline of 1 year. The total intensity of the pulsar is seen to vary on a 6-month time scale. The spectrum is hard but, like other X-ray pulsars, steepens at energies above 20 keV.

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