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The Henon-Heiles system was originally proposed to describe the dynamicalbehavior of galaxies, but this system has been widely applied in dynamicalsystems by exhibit great details in phase space. This work presents theformalism to describe Henon-Heiles system and a qualitative approach ofdynamics behavior. The growth of chaotic region in phase space is observed byPoincare Surface of Section when the total energy increases. Island ofregularity remain around stable points and relevants phenomena appear, such assticky.

Transi\c{c}\~ao de fase no sistema de H\'enon-Heiles (Phase transition in the Henon-Heiles system)