Dλ1, ` =

for light and radial velocity variations due to nonradial pulsations Jadwiga Daszyńska-Daszkiewicz (IAUWr) In order to obtain theoretical amplitudes and phases due to nonradial pulsations, two inputs are needed • models of stellar atmospheres, • nonadiabtic theory of stellar pulsation. In the case of main-sequence pulsators, it is justified to assume • plane-parallel and temporary static atmospheres, • linear pulsations. To calculate amplitudes and phases of the photometric changes in pass-band λ, it is most convenient to consider an expression in the complex form (Daszyńska-Daszkiewicz et al. 2002) Aλ(i) = −1.086εY m ` (i, 0)bλ ` (Dλ1,`f +D2, ` +Dλ3,`) (1) wher