Electronic Journal of Differential Equations, Vol. 2012 (2012), No. 193, pp. 1-45. Title: Stabilization of a linear Timoshenko system with infinite history and applications to the Timoshenko-heat systems Authors: Aissa Guesmia (Metz Univ., France) Salim A. Messaoudi (KFUPM, Dhahran, Saudi Arabia) Abdelaziz Soufyane (Alhosn Univ., Abu Dhabi, UAE) Abstract: In this article, we, first, consider a vibrating system of Timoshenko type in a one-dimensional bounded domain with an infinite history acting in the equation of the rotation angle. We establish a general decay of the solution for the case of equal-speed wave propagation as well as for the nonequal-speed case. We, also, discuss the well-posedness and smoothness of solutions using the semigroup theory. Then, we give applications to the coupled Timoshenko-heat systems (under Fourier's, Cattaneo's and Green and Naghdi's theories). To establish our results, we adopt the method introduced, in [13] with some necessary modifications imposed by the nature of our problems since they do not fall directly in the abstract frame of the problem treated in [13]. Our results allow a larger class of kernels than those considered in [28,29,30], and in some particular cases, our decay estimates improve the results of [28,29]. Our approach can be applied to many other systems with an infinite history. Submitted April 9, 2012. Published November 06, 2012. Math Subject Classifications: 35B37, 35L55, 74D05, 93D15, 93D20. Key Words: General decay; infinite history; relaxation function; Timoshenko; thermoelasticity.