Stellar Populations in the Outskirts of M33

We present V and I photometry of seven fields in the outskirts of M33 to search for stellar structures in correspondence of neutral hydrogen (Hi) clouds recently discovered in a 21-cm survey of this galaxy [2]. We analyse the stellar population out to 2 ∘ from the centre of M33 by means of V, I colour magnitude diagrams reaching the red clump (RC). We detect intermediate-age (1–10 Gyr) stars out to a deprojected radius of 30 kpc ( ∼ 20 scale lengths), but we do not find evidence for a clear correlation between the Hi complexes and the stellar substructures.