Truncated Hermite polynomials

We consider the family of polynomials $p_{n}\left( x;z\right) ,$ orthogonal with respect to the inner product $$\left\langle f,g\right\rangle = \int_{-z}^{z} f\left( x\right) g\left( x\right) e^{-x^{2}} \,dx.$$ We show some properties about the coefficients in their 3-term recurrence relation, connections between $p_{n}\left( x;z\right)$ and $p_{n}^{\prime}\left( x;z\right) ,$ a second order differential equation satisfied by $p_{n}\left( x;z\right) ,$ and an electrostatic interpretation of their zeros.