A tale of a rich cluster at z$\sim$0.8 as seen by the Star Formation
  Histories of its ETGs
  We present a detailed stellar population analysis for a sample of 24
early-type galaxies belonging to the rich cluster RXJ0152.7-1357 at z=0.83. We
have derived the age, metallicity, abundance pattern and star formation history
for each galaxy individually, to further characterize this intermediate-z
reference cluster. We then study how these stellar population parameters depend
on local environment. This provides a better understanding on the formation
timescales and subsequent evolution of the substructures in this cluster. We
have also explored the evolutionary link between z$\sim$0.8 ETGs and those in
the local Universe by comparing the trends that the stellar population
parameters follow with galaxy velocity dispersion at each epoch. We find that
the ETGs in Coma are consistent with being the (passively-evolving) descendants
of the ETG population in RXJ10152.7-1357. Furthermore, our results favor a
downsizing picture, where the subclumps centers were formed first. This central
parts contain the most massive galaxies, which formed the bulk of their stars
in a short, burst-like event at high-z. On the contrary, the cluster outskirts
are populated with less massive, smaller galaxies, which show a wider variety
of Star Formation Histories. In general, they present extended star formation
episodes over cosmic time, which seems to be related to their posterior
incorporation into the cluster, around 4Gyr later after the initial event of
formation.
