A possible 13.81 D period of the X-ray binary 4U 1700-377

Astronomy and Astrophysics – Astrophysics

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X-Rays: Stars

Scientific paper

We report the results of a temporal analysis of CGRO BATSE and RXTE ASM All-Sky monitor X-ray light curves of the high mass XRB 4U 1700-377. In addition to the known orbital period of 3.41 d we found evidence for the existence of a second periodicity of about 13.81 d in the light curves of both satellites. We suggest that this new period might be due to the free precession of the neutron star.

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