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- W2111678085 abstract "A synthetic stellar time series simulating the obser- vational radial velocity curve of a variable star is generated as follows. A 2D Lattice Gas (LG) model adapted to mimic the nonlinear nonradial behaviour of a vibrationally unstable plane-parallel stellar atmosphere representative for Long Pe- riod Variables is integrated over some 15 cycles. The model exhibits a complex spatio-temporal behaviour, showing simul- taneously localised zones of expansion and contraction. The vertical component of the velocity field averaged over the at- mosphere defines a noisy, cyclic time signal which is filtered with a Neural Network (NN) device. The analysis of the filtered signal by the method of Global Flow Reconstruction demon- strates that the latter is reproduced by a low dimensional (=4) dynamical system. The experiment is thus indicative that the actual high- dimensional fluid dynamics describing the full 3D behaviour of a real star possesses an approximately autonomous low- dimensional directly observable radial subdynamics which alone is accessible with the conventional global observational procedures. Comments are made on the relation between this observable subdynamics and the observationally hidden full dy- namics of the star." @default.
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- W2111678085 date "1998-06-01" @default.
- W2111678085 modified "2023-09-26" @default.
- W2111678085 title "What can we learn from observational stellar time series" @default.
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