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Fig. 2

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Possible secular trajectories for the HD 74156 system seen in the (ω1,I) plane (left), and in the (ω1,e1) plane (right). We show the trajectories using the quadrupolar approximation (top), corresponding to the level curves of constant energy, and the octupolar approximation (bottom). The dashed black curves in the (ω1,I) plane correspond to the separatrix between the circulation and libration zones of ω1. The colors are preserved in all pictures, each one corresponding to a given value of the total angular momentum of the system (determined by different values of the initial mutual inclination). All trajectories are compatible to the present knowledge for this system (Table 2).

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