Open Access

This article has an erratum: [https://doi.org/10.1051/0004-6361/201834344e]


Fig. 1

image

Parameter space of Colombo’s top Hamiltonian (Eq. (18)). There is no separatrix (and thus no resonance) in region D, delimited by the curve (Eq. (20), thick black line). The curves and (Eq. (25), thin black lines) delimit regions A–B and B–C, respectively. In region A, the resonance island lies between Σ and Σ+ (Eq. (24)); in region B, it lies between Σ and + 1; in region C, it lies between − 1 and + 1 (hence the 180o full width given by the colour scale). The problem becomes unphysical above β = 2γ (blue line) since it corresponds to an amplitude Sp > 1 in the inclination series.

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