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IAUC 4489 available at Central Bureau for Astronomical Telegrams. IAUC 4489 available at Central Bureau for Astronomical Telegrams.
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The Cometary Knots in the Helix Nebula have shown themselves to be formed of a head which is a photoionized surface, optically thick to Lyman continuum radiation, on the central star facing sides of neutral clumps and a cometary tails photionized by the diffuse radiation field. In this study we will present the results of a photoionization model of
We present results of numerical 3D simulation of propagation of MHD waves in sunspots. We used two self consistent magnetohydrostatic background models of sunspots. There are two main differences between these models: (i) the topology of the magnetic field and (ii) dependence of the horizontal profile of the sound speed on depth. The model with
We studied the nuclear obscuration of galaxies hosting Low Ionization Narrow Emission Regions (LINERs) based on their X-ray and optical emission. X-ray data show that high obscuration is a common property of LINERs, 50% of them are identified as good candidates to be Compton-thick. From the Hα HST-imaging analysis it is found that the large
