Magnetic fields play a key role in most astrophysical systems, from the Sun to active galactic nuclei. They can be studied through their effects on atomic energy levels, which produce polarized spectral lines. In particular, anisotropic radiation `pumping' processes (which send electrons to higher atomic levels) induce population imbalances that

Ellipsoidal lightcurves of XTE J1118+48 during its decline to quiescence are strongly contaminated with a superhump wave. A PDM period analysis yields Psh = 0.17049(1) d i.e. 0.3% longer than the orbital period. This implies a disc precession period Pprec ~52 d and q ~0.03.

We present spherically symmetric and plane-parallel photoionization models of NGC 346, an H II region in the Small Magellanic Cloud. The models are based on CLOUDY and on the observations of Peimbert, Peimbert, & Ruiz. We find that approximately 45% of the H ionization photons escape from the H II region, providing an important ionizing source for

A project to survey the entire visible sky for the presence of transits by extrasolar planets is presented. The experiment would consist of one or two fixed arrays of wide-angle cameras, that would take images of the entire sky more then 30 deg above horizon. A preliminary design consists of 15 cameras in each array, with optics based on SLR camera

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The relation between the X-ray, the coronal line and the infrared (IR) emissions in a sample of the brightest known Seyfert galaxies is analysed. A close relationship between the absorption-corrected soft X-ray emission and both the mid-IR and the coronal line emission is found for the Seyfert type 2 objects in the sample. The coronal line and the