Pulsations of delta Scuti stars

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1111/j.1749-6632.1990.tb37796.x· OSTI ID:5295921

Cox, A N

A general review of the pulsating {delta} Scuti variables is given including the observed light curves and positions of the stars in the Hertzsprung-Russell diagram. Theoretical interpretations from evolution and pulsation calculations give their masses, radii, luminosities, and even their approximate internal compositions. Three models of these stars are discussed and used to study the nonlinear hydrodynamic behavior of these stars. The hydrodynamic equations and the Stellingwerf method for obtaining strictly periodic solutions are outlined. Problems of allowing for time-dependent convection and its great sensitivity to temperature and density are presented. Tentative results to date do not show any tendency for amplitudes to grow to large unobserved amplitudes, in disagreement with an earlier suggestion by Stellingwerf. It is found that the very small growth rates of the pulsations may even be too small to be useful in seeking a periodic solution. 15 refs., 8 figs., 3 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/MA
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5295921
• Report Number(s): LA-UR-89-3772; CONF-8910308--1; ON: DE90003213
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DIAGRAMS
HERTZSPRUNG-RUSSELL DIAGRAM
HYDRODYNAMIC MODEL
ITERATIVE METHODS
MATHEMATICAL MODELS
NEWTON METHOD
NONLINEAR PROBLEMS
PARTICLE MODELS
PULSATING VARIABLE STARS
STARS
STATISTICAL MODELS
THERMODYNAMIC MODEL
VARIABLE STARS