The mode trapping properties of full DA white dwarf evolutionary models

Free access article

Issue		A&A Volume 387, Number 2, May IV 2002


Page(s)		531 - 549
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20020384

A&A 387, 531-549 (2002)
DOI: 10.1051/0004-6361:20020384

The mode trapping properties of full DA white dwarf evolutionary models

A. H. Córsico, L. G. Althaus, O. G. Benvenuto and A. M. Serenelli

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

(Received 21 January 2002 / Accepted 8 March 2002 )

Abstract
An adiabatic, non-radial pulsation study of a 0.563 $M_{\odot}$ 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.

Key words: stars: evolution -- stars: interiors -- stars: white dwarfs -- stars: oscillations

Offprint request: A. H. Córsico, acorsico@fcaglp.fcaglp.unlp.edu.ar

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