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The variable X-ray spectrum of Cyg XR-1

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Abstract

The variability of the X-ray spectrum of the discrete source Cyg XR-1 (α = 19h 56m δ = +35°.1) is reviewed. The variations observed in the energy region accessible to balloon borne detectors (energies greater than 20 keV) can be explained by assuming them to be caused by the eclipsing properties of a binary system. It is suggested that the system is composed of a source of small angular extent having a spectrum similar to that of a black body at approximately 1.5 × 108 K (kT= 12.5 keV) and a non X-radiating companion which eclipses it at intervals of 2.9850 days. The system would be surrounded by an X-radiating plasma whose photon flux between 1 and 100 keV can be approximated by a power law spectrum whose exponent is — 1.7.

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References

  • Bingham, R. G. and Clark, C. D.: 1969, Astrophys. J. 158, 207.

    Article  ADS  Google Scholar 

  • Bleeker, J. A. M., Burger, J. J., Deerenberg, A. J. M., Scheepmaker, A., Swanenburg, B. N., and Tanaka, Y.: 1967, Astrophys. J. 147, 391.

    Article  ADS  Google Scholar 

  • Boldt, E., McDonald, F. B., Riegler, G., and Serlemitsos, P.: 1966, Phys. Rev. Letters 17, 447.

    Article  ADS  Google Scholar 

  • Bowyer, S., Byram, E. T., Chubb, T. A., and Friedman, H.: 1965, Science 147, 394.

    ADS  Google Scholar 

  • Bradt, H., Garmire, G., Oda, M., Spada, G., Sreekantan, B. V., Gorenstein, P., and Gursky, H.: 1968, Space Sci. Rev. 8, 471.

    Article  ADS  Google Scholar 

  • Brini, D., Cattani, D., Ciriegi, U., Fuligni, F., Galli, M., Gandolfi, A., Moretti, E., and Sacchi, C.: 1965, Ann. Astrophys. 28, 1034.

    ADS  Google Scholar 

  • Brini, D., Ciriegi, U., Fuligni, F., Moretti, E., and Vespignani, G.: 1967, Astrophys. J. 149, 429.

    Article  ADS  Google Scholar 

  • Burbidge, E. M., Lynds, C. R., and Stockton, A. N.: 1967, Astrophys. J. (Letters) 150, L95.

    Article  ADS  Google Scholar 

  • Byram, E. T., Chubb, T. A., and Friedman, H.: 1966, Science 152, 66.

    ADS  Google Scholar 

  • Chodil, G., Mark, H., Rodrigues, R., Seward, F. D., and Swift, C. D.: 1967, Astrophys. J. 150, 57.

    Article  ADS  Google Scholar 

  • Chodil, G., Mark, H., Rodrigues, R., and Swift, C. D.: 1968, Astrophys. J. (Letters) 151, L1.

    Article  ADS  Google Scholar 

  • Clark, G. W., Lewin, W. H. G., and Smith, W. B.: 1968, Astrophys. J. 151, 21.

    Article  ADS  Google Scholar 

  • Fisher, P. C., Johnson, H. M., Jordan, W. C., Meyerott, A. J., and Acton, L. W.: 1966, Astrophys. J. 143, 203.

    Article  ADS  Google Scholar 

  • Fisher, P. C., Jordan, W. C., Meyerott, A. J., Acton, L. W., and Roethig, D. T.: 1968, Astrophys. J. 151, 1.

    Article  ADS  Google Scholar 

  • Floyd, F. W.: 1969, Nature 222, 967.

    Article  ADS  Google Scholar 

  • Friedman, H., Byram, E. T., and Chubb, T. A.: 1967, Science 156, 374.

    ADS  Google Scholar 

  • Frye, G. and Wang, C.: 1967, Phys. Rev. Letters 18, 132.

    Article  ADS  Google Scholar 

  • Giacconi, R., Gorenstein, P., Gursky, H., and Waters, J. R.: 1967, Astrophys. J. (Letters) 148, L119.

    Article  ADS  Google Scholar 

  • Glass, I. S.: 1969, Astrophys. J. 157, 215.

    Article  ADS  Google Scholar 

  • Gorenstein, P., Giacconi, R., and Gursky, H.: 1967, Astrophys. J. (Letters) 150, L85.

    Article  ADS  Google Scholar 

  • Grader, R. J., Hill, R. W., Seward, F. D., and Toor, A.: 1966, Science 152, 1499.

    ADS  Google Scholar 

  • Gursky, H., Gorenstein, P., and Giacconi, R.: 1967, Astrophys. J. (Letters) 150, L75.

    Article  ADS  Google Scholar 

  • Hayakawa, S., Matsuoka, M., and Yamashita, K.: 1966, Proc. IX Int. Conf. on Cosmic Rays (London), p. 119.

  • Haymes, R. C., Ellis, D. V., Fishman, G. J., Glenn, S. W., and Kurfess, J. D.: 1968, Astrophys. J. (Letters) 151, L125.

    Article  ADS  Google Scholar 

  • Kraft, R. P. and Demoulin, M. H.: 1967, Astrophys. J. (Letters) 150, L183.

    Article  ADS  Google Scholar 

  • Kristian, J., Sandage, A., and Westphal, J. A.: 1967, Astrophys. J. (Letters) 150, L99.

    Article  ADS  Google Scholar 

  • Lewin, W. H. G., Clark, G. W., and Smith, W. B.: 1968a, Can. J. Phys. 46, S409.

    Google Scholar 

  • Lewin, W. H. G., Clark, G. W., and Smith, W. B.: 1968b, Astrophys. J. (Letters) 152, L55.

    Article  ADS  Google Scholar 

  • Mark, H., Price, R., Rodrigues, R., Seward, F. D., and Swift, C. D.: 1969, Astrophys. J. (Letters) 155, L143.

    Article  ADS  Google Scholar 

  • McClintock, J. E., Lewin, W. H. G., Sullivan, R. J., and Clark, G. W.: 1969, Nature 223, 162.

    Article  ADS  Google Scholar 

  • McCracken, K. G.: 1966, Science 154, 1000.

    ADS  Google Scholar 

  • Meekins, J. F., Henry, R. C., Fritz, G., Friedman, H., and Byram, E. T.: 1969, Astrophys. J. 157, 197.

    Article  ADS  Google Scholar 

  • Metzger, A. E. and Dolan, J. F.: 1968, Astron. J. 73, S107.

    Google Scholar 

  • Nather, R. E. and Warner, B.: 1969, Monthly Notices Roy. Astron. Soc. 143, 145.

    ADS  Google Scholar 

  • Oda, M., Bradt, H., Garmire, G., Spada, G., Sreekantan, B. V., Gursky, H., Giacconi, R., Gorenstein, P., and Waters, J. R.: 1967, Astrophys. J. (Letters) 148, L5.

    Article  ADS  Google Scholar 

  • Overbeck, J. W. and Tananbaum, H. D.: 1968a, Astrophys. J. 153, 899.

    Article  ADS  Google Scholar 

  • Overbeck, J. W. and Tananbaum, H. D.: 1968b, Phys. Rev. Letters 20, 24.

    Article  ADS  Google Scholar 

  • Overbeck, J. W., Womack, E. A., and Tananbaum, H. D.: 1967, Astrophys. J. 150, 47.

    Article  ADS  Google Scholar 

  • Peterson, L. E., Jacobson, A. S., Pelling, R. M., and Schwartz, D. A.: 1968, Can. J. Phys. 46, S437.

    Google Scholar 

  • Prendergast, K. H. and Burbidge, G. R.: 1968, Astrophys. J. (Letters) 151, L83.

    Article  ADS  Google Scholar 

  • Reinert, C. P.: 1969, Ph.D. thesis (unpublished), University of Minnesota.

  • Riegler, G.: 1969a, Ph.D. thesis (unpublished), University of Maryland.

  • Riegler, G.: 1969b, private communication.

  • Roccia, R., Rothenflug, R., Boclet, D., and Durouchoux, P.: 1969, Astron. and Astrophys. 1, 48.

    ADS  Google Scholar 

  • Westphal, J. A., Sandage, A., and Kristian, J.: 1968, Astrophys. J. 154, 139.

    Article  ADS  Google Scholar 

  • Woltjer, L.: 1964, Astrophys. J. 140, 1309.

    Article  MathSciNet  ADS  Google Scholar 

Download references

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  1. Warner and Swasey Observatory, Case Western Reserve University, Cleveland, Ohio, USA

    Joseph F. Dolan

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  1. Joseph F. Dolan
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Dolan, J.F. The variable X-ray spectrum of Cyg XR-1. Space Sci Rev 10, 830–868 (1970). https://doi.org/10.1007/BF00167340

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