  We propose a phenomenological extended vector meson dominance model for the
baryon electromagnetic structure, and it is found that the current experimental
data on the $\Sigma$ and $\Xi$ electromagnetic form factors in the time-like
region can be well described. Meanwhile, we can also reproduce the ratios of
the total cross sections of reactions $e^+e^- \to \Sigma^+\bar{\Sigma}^-$,
$\Sigma^0\bar{\Sigma}^0$, and $\Sigma^-\bar{\Sigma}^+$, which are $9.7 \pm 1.3
: 3.3 \pm 0.7 :1$ at center-of-mass energies from $2.3864$ to $3.02$ GeV. We
also analytically continue the expression of the form factors to space-like
region and estimate the charge radii of the $\Sigma$ and $\Xi$ hyperons. The
result for the $\Sigma^-$ is in agreement with the experimental date.
