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

Nature volume 275, pages 400–403 (1978)Cite this article

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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Authors and Affiliations

  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138

    A. K. Dupree, R. J. Davis, H. Gursky, L. W. Hartmann & J. C. Raymond

  2. Goddard Space Flight Center, Greenbelt, Maryland, 20771

    A. Boggess, A. Holm, Y. Kondo & C.-C. Wu

  3. Astronomy Division, ESTEC, Noordwijk, Holland

    F. Macchetto

  4. SRC, Appleton Laboratory, Slough, Berks, UK

    M. C. W. Sandford

  5. University College London, Gower Street, London, WC1, UK

    A. J. Willis & R. Wilson

  6. Osservatorio Astrofisico, I-36012, Asiago, Italy

    F. Ciatti

  7. Dominion Astrophysical Observatory, Victoria, BC, Canada, V8X 3X3

    J. B. Hatchings

  8. Lockheed Palo Alto Research Laboratory, Palo Alto, California, 94304

    H. M. Johnson

  9. Tokyo Astronomical Observatory, University of Tokyo, Mitaka-shi, Tokyo, Japan

    J. Jugaku

  10. Anglo-Australian Observatory, Epping, N.S.W., 2121, Australia

    D. C. Morton

  11. Laboratorio di Fisico Cosmico del C.N.R., Milano, Italy

    A. Treves

  12. Astronomical Institute, Amsterdam, Holland

    E. P. J. van den Heuvel

Authors
  1. A. K. Dupree
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  2. R. J. Davis
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  6. A. Boggess
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  8. Y. Kondo
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  9. C.-C. Wu
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  13. R. Wilson
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  17. J. Jugaku
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  20. E. P. J. van den Heuvel
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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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