7 papers · 1 filter
Eigenfrequency sensitivity in nonadiabatic stellar pulsations
Jan Zalewski
We derive an adjoint formulation of eigenfrequency sensitivity for linear nonadiabatic stellar pulsations, including the frequency dependence of the boundary conditions. Local sens…
Power balance and anomalous exchange in post-AGB pulsations
Jan Zalewski
We develop a complex balance relation for stellar pulsations whose real and imaginary parts give paired relations for the excitation rate and oscillation frequency. The formulation…
Thermodynamic exchange and mode stability in strongly nonadiabatic radial pulsations
Jan Zalewski
We apply the quadratic balance relation for linear nonadiabatic pulsations to radial modes of a sequence of post-AGB envelope models covering . Th…
A generalized quadratic balance relation for nonradial nonadiabatic pulsations
Jan Zalewski
We derive a generalized quadratic balance relation for linear nonadiabatic, nonradial stellar pulsations, starting from a sesquilinear amplitude analogue of the pressure-volume-rat…
A quadratic balance relation for radial nonadiabatic pulsations
Jan Zalewski
Using a sesquilinear pressure - rate of volume change kernel and linear pulsation equations, we formulate a balance relation combining work integral, surface terms, norm integral a…
On the numerical reliability of nonadiabatic pulsation solutions in AGB envelopes
Jan Zalewski
We re-examine integration methods of linear nonadiabatic radial pulsations in the envelopes of AGB and post-AGB stars using the subspace shooting formulation. In the article the ac…
Boundary conditions for radial pulsations in AGB envelopes
Jan Zalewski
We present a formulation of outer and inner boundary conditions for radial non-adiabatic pulsations in AGB/post-AGB envelopes in terms of local structure of pulsation equations. Th…