Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint 14/97

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

Michael König and Michael Maisack

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

accepted by Astronomy & Astrophysics

Abstract. 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 3.41d we found evidence for the existence of a second periodicity of about 13.81d 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

Paper (208k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 06-Oct-1997