Astronomy Letters

, Volume 32, Issue 12, pp 804–815 | Cite as

Observational manifestations of the change in the tilt of the accretion disk to the orbital plane in her X-1/HZ her with phase of its 35-day period

  • D. K. Klochkov
  • N. I. Shakura
  • K. A. Postnov
  • R. Staubert
  • J. Wilms
  • N. A. Ketsaris


We analyze and interpret the RXTE/ASM X-ray light curves for the close binary system Her X-1/HZ Her obtained from February 1996 to September 2004. Some of the features found previously in the averaged X-ray light curves are confirmed by the new RXTE/ASM data. In particular, the anomalous dips and post-eclipse recoveries in two successive orbits in the short-on state are clearly distinguishable and are stable features of the X-ray light curves. We argue that to account for these features, the tilt of the accretion disk to the orbital plane must be assumed to change with phase of the 35-day period. We present a numerical model that can reproduce the observed features of the light curves.

Key words

accretion accretion disks stars binary systems 

PACS numbers



Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. M. Bardeen and J. A. Petterson, Astrophys. J. 195, L65 (1975).CrossRefADSGoogle Scholar
  2. 2.
    J. M. Blondin, New Astron. 5, 53 (2000).CrossRefADSGoogle Scholar
  3. 3.
    N. G. Bochkarev and E. A. Karitskaia, Astron. Astrophys. Suppl. Ser. 154, 189 (1989).Google Scholar
  4. 4.
    H. Bradt, R. Rothschild, and J. Swank, Astron. Astrophys. Suppl. Ser. 97, 355 (1993).ADSGoogle Scholar
  5. 5.
    K. Brecher, Nature 239, 325 (1972).CrossRefADSGoogle Scholar
  6. 6.
    D. Crampton, Astrophys. J. 187, 345 (1974).CrossRefADSGoogle Scholar
  7. 7.
    L. Crosa and P. Boynton, Astrophys. J. 235, 999 (1980).CrossRefADSGoogle Scholar
  8. 8.
    D. Gerend and P. E. Boynton, Astophys. J. 209, 562 (1976).CrossRefADSGoogle Scholar
  9. 9.
    R. Giacconi, H. Gursky, E. Kellogg, et al., Astrophys. J. 184, 227 (1973).CrossRefADSGoogle Scholar
  10. 10.
    A. Gorecki, A. Levine, M. Bautz, et al., Astrophys. J. 256, 234 (1982).CrossRefADSGoogle Scholar
  11. 11.
    S. C. Inam and A. Baykal, Mon. Not. R. Astron. Soc., in press, 2005 (astro-ph-0506227).Google Scholar
  12. 12.
    J. I. Katz, S. F. Anderson, B. Margon, et al., Astrophys. J. 260, 780 (1982).CrossRefADSGoogle Scholar
  13. 13.
    N. A. Ketsaris, M. Kuster, K. Postnov, et al., in Proc. Int. Workshop “Hot Points in Astrophysics,” Ed. by V. Belyaev (JINR, Dubna, 2000), p. 192; astro-ph/0010035.Google Scholar
  14. 14.
    M. Kuster, J. Wilms, and R. Staubert, Astron. Astrophys, in preparation, 2006 (astro-ph/0507198).Google Scholar
  15. 15.
    D. A. Leahy, Mon. Not. R. Astron. Soc. 287, 622 (1997).ADSGoogle Scholar
  16. 16.
    D. A. Leahy, H. Marshall, and S. D. Mattew, Astrophys. J. 542, 446 (2000).CrossRefADSGoogle Scholar
  17. 17.
    A. M. Levine, H. Bradt, W. Cui, et al., Astrophys. J. 469, L33 (1996).CrossRefADSGoogle Scholar
  18. 18.
    A. M. Levine and J. G. Jernigan, Astrophys. J. 262, 294 (1982).CrossRefADSGoogle Scholar
  19. 19.
    T. Oosterbroek, A. N. Parmar, F. D. Dal, et al., Astron. Astrophys. 353, 575 (2000).ADSGoogle Scholar
  20. 20.
    J. A. Petterson, Astrophys. J. 214, 550 (1977).MathSciNetCrossRefADSGoogle Scholar
  21. 21.
    M. Revnivtsev, S. Fabrika, P. Abolmasov, et al., Astron. Astrophys, in press, 2005 (astro-ph/0501516).Google Scholar
  22. 22.
    S. Schandl, Astron. Astrophys. 307, 95 (1996).ADSGoogle Scholar
  23. 23.
    S. Schandl and F. Meyer, Astron. Astrophys. 289, 149 (1994).ADSGoogle Scholar
  24. 24.
    D. M. Scott and D. A. Leahy, Astrophys. J. 510, 974 (1999).CrossRefADSGoogle Scholar
  25. 25.
    N. I. Shakura, in Nova Science Publishers, Ed. by A. Kaminker and N. Commack (1995), p. 55.Google Scholar
  26. 26.
    N. I. Shakura, N. A. Ketsaris, M. E. Prokhorov, and K. A. Postnov, Mon. Not. R. Astron. Soc. 200, 992 (1998a).ADSGoogle Scholar
  27. 27.
    N. I. Shakura, K. Postnov, and M. Prokhorov, Astron. Astrophys. 300, 992 (1998b).Google Scholar
  28. 28.
    N. I. Shakura, N. A. Ketsaris, M. E. Prokhorov, and K. A. Postnov, Astron. Astrophys. 348, 917 (1999).ADSGoogle Scholar
  29. 29.
    N. I. Shakura and R. A. Sunyaev, Astron. Astrophys. 24, 337 (1973).ADSGoogle Scholar
  30. 30.
    R. Staubert, M. Bezler, and E. Kendziorra, Astron. Astrophys. 117, 215 (1983).ADSGoogle Scholar
  31. 31.
    R. Staubert, S. Schandl, and J. Wilms, in Proc. of the Fifth Compton Symposium, Ed. by M. L. McConnell and J. M. Ryan (aIP CP, 2000), pp. 510, 153.Google Scholar
  32. 32.
    R. Staubert, S. Schandl, D. Klochkov, et al., in Proc. of the Transient Milky Way: A Perspective for MN-RAX, Ed. by F. D’Amico, J. Braga, and R. Rothschild, 2005.Google Scholar
  33. 33.
    R. Staubert, S. Schandl, J. Wilms, et al., Astron. Astrophys, in press, 2006.Google Scholar
  34. 34.
    M. Still and P. Boyd, Astrophys. J. 606, L135 (2004).CrossRefADSGoogle Scholar
  35. 35.
    M. Still, K. O’Brien, K. Horne, et al., Astrophys. J. 553, 776 (2001).CrossRefADSGoogle Scholar
  36. 36.
    H. Tananbaum, H. Gursky, E. Kellogg, R. Giacconi, and C. Jones, Astrophys. J. 174, L143 (1972).CrossRefADSGoogle Scholar
  37. 37.
    J. Trümper, P. Kahabka, H. Ögelman, W. Pietsch, and W. Voges, Astrophys. J. 300, L63 (1986).CrossRefADSGoogle Scholar
  38. 38.
    S. D. Vrtilek and J. P. Halpern, Astrophys. J. 296, 606 (1985).CrossRefADSGoogle Scholar
  39. 39.
    J. Wilms, N. Ketsaris, M. Kuster, et al., Izvestiya Akad. Nauk, Ser. Fizicheskaya 67, 310 (2003).Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • D. K. Klochkov
    • 1
  • N. I. Shakura
    • 2
  • K. A. Postnov
    • 2
  • R. Staubert
    • 1
  • J. Wilms
    • 3
  • N. A. Ketsaris
    • 2
  1. 1.Institut für Astronomic und AstrophysikUniversity of TübingenTübingenGermany
  2. 2.Sternberg Astronomical InstituteMoscowRussia
  3. 3.Department of PhysicsUniversity of WarwickCoventryUK

Personalised recommendations