I summarize the tools of Bayesian theory for inference that are recently being applied to extract information from spectro-polarimetric data obtained with the most advanced instruments. I present the machinery to carry out inference, model comparison and model averaging, together with some illustrative examples, with the hope that the power of

The weak-field approximation is one of the simplest models that allows us to relate the observed polarization induced by the Zeeman effect with the magnetic field vector present on the plasma of interest. It is usually applied for diagnosing magnetic fields in the solar and stellar atmospheres. A fully Bayesian approach to the inference of magnetic

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The activities, rotational velocities, radial velocities and kinematic space motions are presented for over 850 dwarf and subgiant FGK type stars. The chromospheric activities were measured using the CaII HK lines and high resolution and high S/N FEROS spectra. The radial velocities were determined by cross-correlation with a number of template

Listed are the [Mg/Fe], [Ca/Fe], [Ti/Fe] and [Si/Fe] abundance ratios for 650 K giants in four fields of the Galactic Bulge. Abundances were measured using standard 1D local thermodynamic equilibrium MARCS models and spectral synthesis using MOOG. The list also includes the metallicities [Fe/H] presented in Zoccali et al. (2008, Cat. J/A+A/486/177)