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We present deep, wide-field g and r photometry of the transition type dwarfgalaxy Leo T, obtained with the blue arm of the Large Binocular Telescope. Thedata confirm the presence of both very young (<1 Gyr) as well as much older (>5Gyr) stars. We study the structural properties of the old and young stellarpopulations by preferentially selecting either population based on their colorand magnitude. The young population is significantly more concentrated than theold population, with half-light radii of 104+-8 and 148+-16 pc respectively,and their centers are slightly offset. Approximately 10% of the total stellarmass is estimated to be represented by the young stellar population. Comparisonof the color-magnitude diagram (CMD) with theoretical isochrones as well asnumerical CMD-fitting suggest that star formation began over 10 Gyr ago andcontinued in recent times until at least a few hundred Myr ago. The CMD-fittingresults are indicative of two distinct star formation bursts, with a quiescentperiod around 3 Gyr ago, albeit at low significance. The results are consistentwith no metallicity evolution and [Fe/H] ~ -1.5 over the entire age of thesystem. Finally, the data show little if any sign of tidal distortion of Leo T.

The structural properties and star formation history of Leo T from deep LBT photometry