IUE observations of X-ray sources : HD 153919 (4U 1700-37), HDE 226868(Cyg X-1), HZ HER (Her X-1).
Davis, R. J.; Raymond, J. C.; Kondo, Y.; Treves, A.; Willis, A. J.; Wilson, R.; Macchetto, F.; Dupree, A. K.; Hutchings, J. B.; Boggess, A.; Hartmann, L. W.; Holm, A.; Wu, C. -C.; van den Heuvel, E. P. J.; Morton, D. C.; Jugaku, J.; Johnson, H. M.; Ciatti, F.; Gursky, H.; Sandford, M. C. W.
United States, Netherlands
Abstract
The first UV spectroscopic measurements of binary X-ray sources with IUE show highly variable emission from a photoionized plasma in the object HZ Her, and give evidence for localized circumsystem material in the binary source Cygnus X-1. In addition, a substantial stellar wind is found in one of the brightest identified X-ray sources HD153919. This system may be surrounded by an extensive H II region unusual in its content of high excitation ion species.