Astronomy Reports

, Volume 46, Issue 12, pp 1022–1029

Structure of gas flows in Z And in quiescence and during outbursts

Authors

  • D. V. Bisikalo
    • Institute of AstronomyRussian Academy of Sciences
  • A. A. Boyarchuk
    • Institute of AstronomyRussian Academy of Sciences
  • E. Yu. Kilpio
    • Institute of AstronomyRussian Academy of Sciences
  • O. A. Kuznetsov
    • Institute of AstronomyRussian Academy of Sciences
    • Keldysh Institute of Applied MathematicsRussian Academy of Sciences
Article

DOI: 10.1134/1.1529260

Cite this article as:
Bisikalo, D.V., Boyarchuk, A.A., Kilpio, E.Y. et al. Astron. Rep. (2002) 46: 1022. doi:10.1134/1.1529260

Abstract

A new mechanism is proposed to account for transitions between the quiescent and active states of symbiotic stars. A numerical study of the gas dynamics of the flows in the symbiotic star Z And shows that even small variations in the velocity of the wind from the cool giant can abruptly change the flow structure near the hot component. Such changes alter the accretion regime as the wind velocity increases: disk accretion makes a transition to accretion from the flow. Our calculations indicate that the accretion rate increases by a factor of several tens over a short time interval (∼0.1 of the orbital period) during the rearrangement of the flow, when the accretion disk is destroyed.

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© MAIK "Nauka/Interperiodica" 2002