Abstract
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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Dupree, A., Davis, R., Gursky, H. et al. IUE observations of X-ray sources: HD153919 (4U1700–37), HDE226868 (Cyg X-1), HZ Her (Her X-1). Nature 275, 400–403 (1978). https://doi.org/10.1038/275400a0
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DOI: https://doi.org/10.1038/275400a0
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