NLTE effects in iron lines are carefully investigated for the sunspot umbral model of Maltby et. al. (1986). Our model atom is realistic: it has hundreds of levels including many high-excited ones among which infrared transitions take place. The self-consistent solution of the kinetic and radiative transfer equations is obtained using recently

CCD and near-IR broad and narrow-band images of HH 14 and 5 small nebula associated with IRAS sources of low luminosity in star forming regions are presented. Optical and IR reflection nebulae were detected associated to the Class I YSOs PP 9, Gy 4-1 and Gy 2-21 with no evidence of shock excitation, while HH14 and L1455FIR show several prominent H

Two inversion techniques are compared: the Unno-Rachkov-sky fitting method (UR) and the Stokes Inversion based on Response functions (SIR). Results with synthetic profiles in sunspot model atmospheres and real data show that whilst UR is well suited for recovering a constant vec B, SIR enables us to know the run with depth of vec B and the line of

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