NGC 6067: a young and massive open cluster with high metallicity
  NGC 6067 is a young open cluster hosting the largest population of evolved
stars among known Milky Way clusters in the 50-150 Ma age range. It thus
represents the best laboratory in our Galaxy to constrain the evolutionary
tracks of 5-7 M$_{\odot}$ stars.
  We have used high-resolution spectra of a large sample of bright cluster
members (45), combined with archival photometry, to obtain accurate parameters
for the cluster as well as stellar atmospheric parameters. We derive a distance
of 1.78$\pm$0.12 kpc, an age of 90$\pm$20 Ma and a tidal radius of
14.8$^{6.8}_{3.2}$ arcmin. We estimate an initial mass above 5700 M$_{\odot}$,
for a present-day evolved population of two Cepheids, two A supergiants and 12
red giants with masses $\approx$6 M$_{\odot}$.
  We also determine chemical abundances of Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y
and Ba for the red clump stars. We find a supersolar metallicity,
[Fe/H]=+0.19$\pm$0.05, and a homogeneus chemical composition, consistent with
the Galactic metallicity gradient. The presence of a Li-rich red giant, star
276 with A(Li)=2.41, is also detected. An over-abundance of Ba is found,
supporting the enhanced $s$-process.
  The ratio of yellow to red giants is much smaller than one, in agreement with
models with moderate overshooting, but the properties of the cluster Cepheids
do not seem consistent with current Padova models for supersolar metallicity.
