Highly dynamically evolved intermediate-age open clusters
  We present a comprehensive UBVRI and Washington CT1T2 photometric analysis of
seven catalogued open clusters, namely: Ruprecht 3, 9, 37, 74, 150, ESO 324-15
and 436-2. The multi-band photometric data sets in combination with 2MASS
photometry and Gaia astrometry for the brighter stars were used to estimate
their structural parameters and fundamental astrophysical properties. We found
that Ruprecht 3 and ESO 436-2 do not show self-consistent evidence of being
physical systems. The remained studied objects are open clusters of
intermediate-age (9.0 < log(t yr-1) < 9.6), of relatively small size (r_cls ~
0.4 - 1.3 pc) and placed between 0.6 and 2.9 kpc from the Sun. We analized the
relationships between core, half-mass, tidal and Jacoby radii as well as
half-mass relaxation times to conclude that the studied clusters are in an
evolved dynamical stage. The cluster masses obtained by summing those of the
observed cluster stars resulted to be ~ 10-15 per cent of the masses of open
clusters of similar age located closer than 2 kpc from the Sun. We found that
cluster stars occupy volumes as large as those for tidally filled clusters.
