A search for X-ray periodicities from 4U 1700-37

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Periodic Variations, Spaceborne Astronomy, Stellar Spectrophotometry, X Ray Spectra, Exosat Satellite, Orbital Elements

Scientific paper

Using the EXOSAT observatory the authors have observed the massive X-ray binary system 4U 1700-37 for more than one complete orbital period. The authors report on a search for X-ray pulsations. No coherent periodicity was detected with upper limits to the pulsed fraction over the frequency range 256 to 2×10-5Hz (corresponding to rotational periods of 3.9 ms to 50000 s) of ≡0.5 to ≡50 per cent.

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