Right $n$-angulated categories arising from covariantly finite subcategories

We define the notion of right $n$-angulated category, which generalizes the notion of right triangulated category. Let $\mathcal{C}$ be an additive category or $n$-angulated category and $\mathcal{X}$ a covariantly finite subcategory, we show that under certain conditions the quotient $\mathcal{C}\mathrm{/}\mathcal{X}$ is a right $n$-angulated category. This result generalizes some previous work.