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Astron. Astrophys. 327, L33-L35

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Letter to the Editor

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

Michael König and Michael Maisack

Institut für Astronomie und Astrophysik-Astronomie, Universität Tübingen, Waldhäuser Strasse 64, D-72076 Tübingen, Germany

Received 8 August 1997 / Accepted 11 September 1997


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.

Key words: X-rays: stars

© European Southern Observatory (ESO) 1997

Online publication: October 20, 1997
Last change: April 6, 1998