  We report on the realization of a magneto-optical trap (MOT) for europium
atoms using a narrow-line cooling transition with a natural linewidth of 97
kHz. Our starting point is continuous capturing and cooling of optically pumped
metastable europium atoms. We have employed simultaneous MOT for the metastable
and ground-state atoms. The trapped metastable atoms are successively pumped
back to the ground state and then continuously loaded to the narrow-line MOT,
where up to $4.7\times10^7$ atoms are captured. A spin-polarized sample at a
temperature of $6\,\mathrm{\mu K}$ and with a peak number density of
$2.2\times10^{11}\,\mathrm{cm^{-3}}$ is obtained through the compression
process, resulting in a phase space density of $3\times10^{-5}$.
