Ae. Sansom et al., DETECTION OF A 5.7-H PERIOD IN THE GLOBULAR-CLUSTER X-RAY SOURCE 4U 1746-371, Monthly Notices of the Royal Astronomical Society, 262(2), 1993, pp. 429-434
Two globular cluster X-ray sources are known to display orbital variab
ility. We report the detection of periodic variability in the X-ray li
ght curve of a third case, 4U 1746 - 371 in NGC 6441, using data from
the Ginga satellite. If orbital, this periodicity confirms that the so
urce is a typical low-mass X-ray binary.