Kinematical studies of the low-mass X-ray binary GR Mus (XB 1254-690)
Kinematical studies of the low-mass X-ray binary GR Mus (XB 1254-690)
We present simultaneous high-resolution optical spectroscopy and X-ray data of the X-ray binary system GR Mus (XB 1254–690), obtained over a full range of orbital phases. The X-ray observations are used to re-establish the orbital ephemeris for this source. The optical data include the first spectroscopic detection of the donor …