Photospheric and chromospheric activity in four young solar-type stars
  We present a photometric and spectroscopic study of four G-K dwarfs, namely HD 166, epsilon Eri, chi1 Ori and kappa1 Cet. In three cases, we find a clear spatial association between photospheric and chromospheric active regions. For chi1 Ori we do not find appreciable variations of photospheric temperature, and chromospheric Halpha emission. We applied a spot/plage model to the observed rotational modulation of temperature and flux to derive spot/plage parameters and to reconstruct a rough three-dimensional map of the outer atmosphere of kappa1 Cet, HD 166 and epsilon Eri. 
Katia Biazzo (1), Antonio Frasca (1), Gregory W. Henry (2), Santo   Catalano (1), Ettore Marilli (1) ((1) INAF - Catania Ast...