The LCID project: star formation history of isolated, Local Group dwarf galaxies
by
Matteo Monelli(IAC)
→
Europe/Stockholm
FA31
FA31
Description
We will present the main results of the
Local Cosmology from Isolated Dwarfs (LCID) project, aimed at deriving
detailed star formation histories over the life time of a sample of six Local
Group isolated dwarf, low metallicity, galaxies: two dIrr (IC1613 and Leo A),
two transition dIrr/dSph (LGS3 and Phoenix) and the only two isolated dSph
in the Local Group (Cetus and Tucana). To accomplish this goal we have
collected, using the ACS on board the HST, color-magnitude diagrams reaching
their oldest main sequence turnoff (V ~ 28) with good photometric accuracy.
Accurate star formation histories have been derived through comparison with
synthetic color-magnitude diagrams, using the IAC-pop algorithm. All galaxies
in our sample, except Leo A, show a substantial amount of old stellar
population, even though the subsequent evolution is varied. We will discuss
the implications of these star formation histories on current scenarios of
dwarf galaxy formation and evolution.
