The mode trapping properties of full DA white dwarf evolutionary models

Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, (1900) La Plata, Argentina Instituto de Astrofísica de La Plata, IALP, CONICET e-mail: althaus,obenvenu,serenell@fcaglp.fcaglp.unlp.edu.ar

Corresponding author: A. H. Córsico, acorsico@fcaglp.fcaglp.unlp.edu.ar

Received: 21 January 2002
Accepted: 8 March 2002

Abstract

An adiabatic, non-radial pulsation study of a 0.563 DA white dwarf model is presented on the basis of new evolutionary calculations performed in a self-consistent way with the predictions of time dependent element diffusion, nuclear burning and the history of the white dwarf progenitor. Emphasis is placed on the role played by the internal chemical stratification of these new models in the behaviour of the eigenmodes, and the expectations for the full g-spectrum of periods. The implications for the mode trapping properties are discussed at length. In this regard, we find that, for high periods, the viability of mode trapping as a mode selection mechanism is markedly weaker for our models, as compared with the situation in which the hydrogen-helium transition region is treated assuming equilibrium diffusion in the trace element approximation.