  This project aims at exploiting the wide-field and limiting-magnitude
capabilities of the LSST to fully characterise the resolved stellar populations
in/around six Local Group stellar systems of different morphological type at
~30 to ~400 kpc distance from us. We selected targets that host red giant
branch (RGB) stars which are within the reach of Gaia and not yet (all)
saturated with the LSST. We will use RR Lyrae stars, Cepheids, SX Phoenicis,
delta Scuti stars and Long Period Variables, along with the Color Magnitude
Diagram of the resolved stellar populations in these 6 systems to: i) trace
their different stellar generations over a spatial extension and with a depth
that only the LSST can achieve; ii) measure their distances using variable
stars of different type/parent stellar population and the Tip of the RGB; iii)
map their 3D structures up to the periphery of their halos; iv) search for
tidal streams; and v) study their Star Formation Histories over unprecedented
large fractions of their bodies. Our ultimate goals are to provide a complete
picture of these nearby stellar systems all the way through to their periphery,
and to directly link and cross-calibrate the Gaia and LSST projects.
