As an example to the potential of on-going AGN surveys we show how to select a set of radio sources with a structure-related objective: e.g. to study the size and properties of the narrow-line emission region (NLR) in AGN. A straight radio jet blasting through the NLR/ISM border suffers shocks that are seen as prominent radio features. From a

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In this work we propose a preliminary seismic investigation of $delta$ Scuti stars in the Pleiades cluster, focusing on potential diagnostics of convection and core-overshooting. Taking into account the effect of fast rotation in the modelling, we compare observed frequencies for 4 $delta$ Scuti stars with radial linear instability predictions. A

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Calculations of energy balance in model stellar atmospheres for cold and moderately cold stars show that the overall energy gained or lost at the Lyman frequencies (lines plus continuum) can be up to 20 orders of magnitude higher than in the rest of the spectrum. Due to the great optical depth at those frequencies, however, monochromatic mean

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