  The half-lives of newly observed $\alpha$-emitters $^{105}$Te and $^{109}$Xe
[Seweryniak \textit{et al.}, Phys. Rev. C \textbf{73}, 061301(R) (2006);
Liddick \textit{et al.}, Phys. Rev. Lett. \textbf{97}, 082501 (2006)] are
investigated by the density-dependent cluster model. The half-lives of
$\alpha$-emitters close to the N=Z line are also studied in a unified framework
where the influence of the nuclear deformation is properly taken into account.
Good agreement between model and data is obtained and some possible
$\alpha$-emitters are suggested for future experiments.
