  We establish the existence of static and spherically symmetric fermion-boson
stars, in a low energy effective model of (beyond) Horndeski theories. These
stars are in equilibrium, and are composed by a mixing of scalar and fermionic
matters that only interact gravitationally one with each other. Properties such
as mass, radius, and compactness are studied, highlighting the existence of two
families of configurations defined by the parameter $c_4$. These families have
distinctive properties, although in certain limits both are reduced to their
counterparts in General Relativity. Finally, by assuming the same conditions
used in General Relativity, we find the maximum compactness of these hybrid
stars and determine that it remains below the so-called Buchdahl's limit.
