  Remote synchronization implies that oscillators interacting not directly but
via an additional unit (hub) adjust their frequencies and exhibit frequency
locking while the hub remains asynchronous. In this paper, we analyze the
mechanisms of remote synchrony in a small network of three coupled
Stuart-Landau oscillators using recent results on high-order phase reduction.
We analytically demonstrate the role of two factors promoting remote synchrony.
These factors are the non-isochronicity of oscillators and the coupling terms
appearing in the second-order phase approximation. We show a good
correspondence between our theory and numerical results for small and moderate
coupling strengths.
