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The results reported in this paper concern two delta Scuties in the Praesepe cluster, namely BN Cnc and BU Cnc, observed during the 1992 STEPHI 4 campaign. Five and six frequency peaks, respectively, were recorded as a result of the campaign. In this work, an attempt is made to identify these frequency peaks as pulsation models, based on stellar

We present near-infrared (JHK) imaging of the Seyfert 2 galaxy NGC 5252, taken with the IRAC2 array on the 2.2m telescope at ESO, La Silla. The unresolved and galactic components to the nuclear emission are separated by a multicomponent fitting of the light profiles in the optical and near-infrared bands. The nuclear flux in a 3" aperture is found

Accurate, absolute, and reproducible measurements are the expected qualities of any instrument. A differential image motion monitor (DIMM) is presented which assesses astronomical seeing with those requirements. It has been designed (with collaboration of the staff of the Department d'Astrophysique de l'Universite de Nice and the Instituto de

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The process of emergence of magnetic flux from the depths of the convection zone to the surface is presented in the framework of self-consistent model for the storage of field in the lower overshoot regions and as the mechanism responsible for some of the regularities observed in active regions. We have performed numerical simulations of the