We consider quantum integrable models associated with $\mathfrak{ so}_3$ algebra. We describe Bethe vectors of these models in terms of the current generators of the $\mathcal{ D}Y(\mathfrak{ so}_3)$ algebra. To implement this approach we use isomorphism between $R$-matrix and Drinfeld current realizations of the Yangians and their doubles for classical types $B$, $C$, and $D$ series algebras. Using these results we derive the actions of the monodromy matrix elements on off-shell Bethe vectors. We show that these action formulas lead to recursions for off-shell Bethe vectors and Bethe equations for on-shell Bethe vectors. The action formulas can also be used for calculating the scalar products in the models associated with $\mathfrak{ so}_3$ algebra.
Categories: math-ph hep-th math.MP