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In this paper, for any nonic number field $K$ defined by a monic irreducibletrinomial $F(x)=x^9+ax^2+b \in \mathbb{Z}[x]$, we calculate $\nu_p(i(K))$ forevery rational prime $p$. In particular, we characterize the index $i(K)$ ofthis family of number fields. As an application of our results, if $i(K)\neq1$,then $K$ is not monogenic. We illustrate our results by some computationalexamples.

The index of certain nonic number fields defined by $x^9+ax^2+b$