The solar activity, following an eleven years cycle, modifies the physical properties of the resonant cavity where the oscillation acoustic modes are trapped. Its effect on p-modes frequencies is a positive shift as the solar activity grows from a minimum to a maximum (Fossat et al. 1987, Pallé et al. 1989, Elsworth et al. 1990). A continuous set

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A detailed NLTE investigation of Fe I lines is carried out within the framework of the MACKKL model of the quiet solar atmosphere. The authors used a realistic iron atom model which allows for the fine term structure and has about 250 levels; it involves nearly 500 UV, optical, and IR bound-bound and bound-free transitions and includes the

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For a decade now, d Scuti stars are considered as very good candidates for asteroseismology and a lot of efforts have been made to fit the increasing number of detected modes with stellar models. While most of the delta Scuti stars are fast rotators (Vsini between 100 and 200 km/s), the importance of this parameter in the theoretical