Optical Photometry of LMXBs: UW CrB (=MS 1603+260) and V1408 Aql (=4U 1957+115)
We present new optical observations NosiLife Socks of V1408 Aql (= 4U 1957+115), the only low mass X-ray binary, black hole candidate known to be in a persistently soft state.We combine new broadband optical photometry with previously published data and derive a precise orbital ephemeris.The optical light curves display sinusoidal variations modula