TY - JOUR

T1 - Stability of the multiple star system iota UMa (ADS 7114)

AU - Мельников, Александр Викторович

AU - Орлов, Виктор Владимирович

AU - Шевченко, Иван Иванович

PY - 2014

Y1 - 2014

N2 - The physical and orbital parameters of the quadruple star system iota UMa (HD 76644 = ADS 7114) were determined earlier, when it was concluded based on modeling the system's dynamics and applying theoretical stability criteria that the system was probably unstable. Here the stability of the iota UMa system is studied by calculating the Lyapunov characteristic exponents for representative sets of parameters and initial conditions. The conclusions on the system's stability (or instability) based on various stability criteria and the calculated Lyapunov exponents are compared. The instability of the system as a whole is confirmed rigorously based on massive computations of the Lyapunov exponents. This system appears to be the only known multiple system whose instability has been rigorously established. The Lyapunov time-disruption time statistical relations are constructed, which show that the Hamiltonian intermittency of the second kind dominates. Typical disruption times are shorter than 1000 years, and the Ly

AB - The physical and orbital parameters of the quadruple star system iota UMa (HD 76644 = ADS 7114) were determined earlier, when it was concluded based on modeling the system's dynamics and applying theoretical stability criteria that the system was probably unstable. Here the stability of the iota UMa system is studied by calculating the Lyapunov characteristic exponents for representative sets of parameters and initial conditions. The conclusions on the system's stability (or instability) based on various stability criteria and the calculated Lyapunov exponents are compared. The instability of the system as a whole is confirmed rigorously based on massive computations of the Lyapunov exponents. This system appears to be the only known multiple system whose instability has been rigorously established. The Lyapunov time-disruption time statistical relations are constructed, which show that the Hamiltonian intermittency of the second kind dominates. Typical disruption times are shorter than 1000 years, and the Ly

U2 - 10.1134/S1063772914090054

DO - 10.1134/S1063772914090054

M3 - Article

VL - 58

SP - 640

EP - 649

JO - Astronomy Reports

JF - Astronomy Reports

SN - 1063-7729

IS - 9

ER -