Adiabatic properties of pulsating DA white dwarfs. IV - an extensive survey of the period structure of evolutionary models

Details Adiabatic properties of pulsating DA white dwarfs. IV - an extensive survey of the period structure of evolutionary models Adiabatic properties of pulsating DA white dwarfs. IV - an extensive survey of the period structure of evolutionary models

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...81..747b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 81, no. 2, Aug. 1992, p. 747-794. Research supported by NSERC, FC

Statistics

Computation

66

Adiabatic Conditions, Stellar Evolution, Stellar Models, Stellar Oscillations, White Dwarf Stars, Computational Astrophysics, Finite Element Method, Galerkin Method, Stellar Convection, Stellar Interiors, Stellar Rotation

Scientific paper

Results of a detailed adiabatic survey of the pulsation properties of evolutionary models of pulsating DA white dwarfs are presented. Pulsation periods, kinetic energies, and first-order rotation coefficients were calculated for all g-modes with l not greater than 2 in the period window 0-1000 s. The survey was carried out with the aid of a new high-performance adiabatic pulsation code based on the Galerkin FEM of weighted residuals. More than 1000 different compositionally stratified equilibrium models were considered in this exploration. The effects of variations in the hydrogen layer mass, the helium layer mass, the convective efficiency, the treatment of the composition transition zones, the total mass, and the effective temperature on the period structure were systematically investigated. The trends observed in the exact results are discussed and compared with the predictions of a previously developed asymptotic model. The key role played by chemical stratification in the pulsation characteristics of the model is highlighted.

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