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We present the work in progress of a study based on photometric andspectroscopic observations of young Weak-line T Tauri and Post T Tauri starsjust attiving on the Zero Age Main Sequence. This study is part of a projectbased on high-resolution spectra obtained with FOCES@CAHA (Spain) and SARG@TNG(Spain) and contemporaneous photometry performed at Catania (Italy) and Ege(Turkey) observatories. The main aim is to investigate the topology of magneticactive regions at photospheric and chromospheric levels in young single stars.Since our targets are slow rotators (vsini < 25 km/s), corresponding torotation periods larger than about 2 days, we are able to apply thespectroscopic technique based on line-depth ratio for the measure of thephotospheric temperature modulation. These stars, possible members of StellarKinematic Groups, display emission cores in the CaII H&K and IRT lines, as wellas a conspicuous filling-in of the Halpha core. Moreover, we detect absorptionof the HeI-D3 line, coming from the upper chromospheric layers, derive thelithium abundance (age indicator), and measure the rotational and radialvelocities. We find a clear rotational modulation, due to photospheric spots,both in the light and the temperature curves. The Halpha and the CaII-IRTemissions display a fair variation correlated with the rotation. Finally, weare developing a spot/plage model to reproduce the data and derive the spotparameters (namely, filling factor and temperature) and to recover informationabout the chromospheric inhomogeneities (flux contrast and filling factor).This study is very important to explore the correlations between global stellarparameters (e.g., surface gravity, effective temperature) and spot/plagecharacteristics in stars with different activity level and evolutionary stage.

Photometric/spectroscopic analyses and magnetic activity in young late-type stars