Abstract
Numerical models has shown that thermal or dynamical processes drive the close binary evolution faster than the classic chemical evolution of their interiors. (e.g. Iben & Tutukov, 1984;Sarna & Federova, 1989;van’t Veer & Maceroni, 1990;Maceroni & van’t Veer, 1991 etc). Especially for contact systems, thermal and/or dynamical instabilities formulate evolutionary scenaria, which are taking place in thermal time-scales and even faster. It seems that contact binaries’ evolution is controlled by two principal evolutionary mechanisms: the thermal relaxation oscillations (TRO) and the tidal (or dynamical, or orbital) instability.
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Rovithis-Livaniou, H., Kalimeris, A. (2000). Orbital Period Changes and Global Evolution of Contact Binaries. In: İbanoğlu, C. (eds) Variable Stars as Essential Astrophysical Tools. NATO Science Series, vol 544. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4299-1_36
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