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This project aims at exploiting the wide-field and limiting-magnitudecapabilities of the LSST to fully characterise the resolved stellar populationsin/around six Local Group stellar systems of different morphological type at~30 to ~400 kpc distance from us. We selected targets that host red giantbranch (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 MagnitudeDiagram of the resolved stellar populations in these 6 systems to: i) tracetheir different stellar generations over a spatial extension and with a depththat only the LSST can achieve; ii) measure their distances using variablestars 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 fortidal streams; and v) study their Star Formation Histories over unprecedentedlarge fractions of their bodies. Our ultimate goals are to provide a completepicture of these nearby stellar systems all the way through to their periphery,and to directly link and cross-calibrate the Gaia and LSST projects.

The Gaia-LSST Synergy: resolved stellar populations in selected Local Group stellar systems