Letter to the Editor
A possible 13.81 d period of the X-ray binary 4U 1700-377
Michael König and
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: April 6, 1998