Variable Stars

Introduction General remarks Historical background and development Discovery and observations Theory Observational data Cepheids and RR Lyrae stars β Cephei stars Long-period variable stars The RV Tauri stars and yellow semiregular variables The red semiregular and irregular variables The explosive variable stars The R Coronae Borealis stars RW Aurigae and T Tauri stars The spectrum and magnetic variables Stars with extremely rapid light variations Theory General equations Equation of continuity (Conservation of mass) Equation of motion (Conservation of momentum) Conservation of energy Linearized equations Radial oscillations of a gaseous sphere under its own gravitation Non-radial oscillations of a gaseous sphere under its own gravitation Non-linear radial oscillations Progressive waves and shock waves Interpretation and applications of the theory The periods Origin and maintenance of finite oscillations The correlation between the amplitudes and the phases of the - velocity and light curves The asymmetry Atmospheric phenomena The continuous spectrum The line spectrum Bibliography