We report simultaneous X-ray, optical, and radio observations of V404 Cyg in quiescence. The X-ray flux varied dramatically by a factor of >20 during a 60 ks observation. X-ray variations were well correlated with those in Hα , although the latter include an approximately constant component as well. Correlations can also be seen with the optical

Using polarimetry, at both visible and submillimeter wavelengths, we propose to study the role and to compare the structure of the magnetic fields within and near filamentary molecular clouds. The optical polarization data obtained at Mont Mégantic and from the Heiles catalog constrain the large scale topology of magnetic fields in the near

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Advanced Stokes Polarimeter observations are used to study the weakest polarization signals observed in the quiet photosphere with flux densities in the range of 1.5-50 Mx cm-2, which are found in internetwork regions. Our analysis allows us to reach an unprecedented spectropolarimetric sensitivity at the cost of sacrificing spatial resolution. We

We present the results of optical and infrared photometry of the quiescent X-ray transient V404 Cyg during the period 1992-2003. The ellipsoidal modulations extracted from the most complete data bases (years 1992, 1998 and 2001) show unequal maxima and minima with relative strength varying from year to year although their peak-to-peak amplitudes