Evidence for a black hole in the historical X-ray transient A 1524-61 (= KY TrA)
Evidence for a black hole in the historical X-ray transient A 1524-61 (= KY TrA)
ABSTRACT We present Very Large Telescope spectroscopy, high-resolution imaging, and time-resolved photometry of KY TrA, the optical counterpart to the X-ray binary A 1524-61. We perform a refined astrometry of the field, yielding improved coordinates for KY TrA and the field star interloper of similar optical brightness that we locate …