IUE observations of X-ray sources: HD153919 (4U1700–37), HDE226868 (Cyg X-1), HZ Her (Her X-1)

@article{Dupree1978IUEOO,
  title={IUE observations of X-ray sources: HD153919 (4U1700–37), HDE226868 (Cyg X-1), HZ Her (Her X-1)},
  author={Andrea K. Dupree and R. J. Davis and Herbert Gursky and Lee Hartmann and John C. Raymond and Albert Boggess and A. Holm and Yoji Kondo and Cc Wu and Ferdinando Duccio Macchetto and Michael C. W. Sandford and Allan J. Willis and R. J. Wilson and Franco Ciatti and J. B. Hatchings and Hugh M. Johnson and Jun Jugaku and Donald C. Morton and Aldo Treves and Edward van den Heuvel},
  journal={Nature},
  year={1978},
  volume={275},
  pages={400-403}
}
The first UV spectroscopic measurements of binary X-ray sources with IUE show highly variable emission from a photoionised plasma in the object HZ Her, and give evidence for localised 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. 

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