We have developed COSMOPACK, a set of tools that transform images of real galaxies to depict their appearance at a given redshift as observed with a given telescope and camera. The transformation includes K-corrections, change of observing band, repixelation to the scale of the observing system, convolution by the seeing, and noise from sky

We present here a method based on a multi-scale analysis adapted to the ISOCAM data, which offers the possibility to separate the different constituents of the signal and detect sources at the very limit of ISOCAM sensitivity, four orders of magnitude below IRAS. The results obtained with this method, called PRETI (for Pattern REcognition Technique

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Polarized light provides key information on the physical conditions and geometry of astrophysical plasmas otherwise unattainable via conventional spectroscopy. In particular, the remote sensing of solar and stellar magnetic fields requires the measurement and rigorous theoretical interpretation of polarization signals in atomic and molecular lines

One of the calibration problems posed by the new generation of mid-infrared instrumentation on 8--10~m class telescopes is that of polarimetric calibration. To be able to calibrate polarimetric data reliably it is necessary to be able to measure both the instrumental polarization and the efficiency of detection of polarization with a high degree of

We present a study over three single-site campaigns to investigate the photometric behaviour of the PNN NGC 246. We observed this object in 2000 and 2001. The analysis of the light curves indicates complex and variable temporal spectra. Using wavelet analysis we have found evidences for changes on time scales of hours in the 2000 dataset. The