Ultraviolet spectroscopy of the blue supergiant SBW1: the remarkably weak wind of a SN 1987A analogue

National Aeronautics and Space Administration (NASA) through HST grants from the Space Telescope Science Institute [GO-12924, GO-11637, GO-11977, GO-13390, GO-13791]; NASA [NAS5-26555]; NSF [AST-1210599, AST-1515559]; Ambizione Fellowship of the Swiss National Science Foundation