SALT observation of X-ray pulse reprocessing in 4U 1626−67

We investigate optical reprocessing of X-rays in the low-mass X-ray binary (LMXB) pulsar 4U 1626−67 in its current spin-up phase using observations with Southern African Large Telescope (SALT), near-simultaneous observations with Swift-X-ray Telescope and non-simultaneous RXTE-Proportional Counter Array (PCA) observations and present the results of timing analysis. Using SALT observations carried ...