5 papers
Any Recent Progress in the Theory of Pulsating Stars?
Alfred Gautschy
To answer the topical question we survey synoptically the recent literature in pulsation theory. We restrict the topics to research on roAp stars, EC 14026 variables, strange modes…
An Attempt to Pin Down the Instability Domain of Long-Period Variables
Alfred Gautschy
The period-luminosity relation of Miras and semiregular variables in the Large Magellanic Cloud and in the Galaxy is used to locate their instability domain in the Hertzsprung-Russ…
On the Robustness of the Cepheids' PL Relation
Alfred Gautschy
The Cepheids' P-L relation got itself talked about again in the recent past due to claims of observed metallicity dependences of at least its zero point. The divergences of the obs…
A fresh look into pulsating PG1159 stars
Alfred Gautschy
To improve the understanding of the pulsational instabilities of some of the PG1159-type pre-white dwarfs we performed detailed stability analyses on helium star evolutionary model…
Overtures to the pulsational instability of ZZ Ceti variables
Alfred Gautschy, Hans-Günter Ludwig, Bernd Freytag
Results of nonradial, nonadiabatic pulsation calculations on hydrogen-rich white dwarf models are presented. In contrast to earlier attempts, the modeling builds on hydrodynamicall…