Asteroseismology of pulsating DA white dwarfs with fully evolutionary models

A. D. ROMERO; A. H. CÓRSICO; L. G. ALTHAUS; M. M. MILLER BERTOLAMI

Liege

Congreso; 40th Liége International Astrophysical Colloquium: “Ageing low mass stars: from red giants to white dwarfs”; 2012

We present a new approach for asteroseismology of DA white dwarfs that consists in theemployment of a large set of non-static, physically sound, fully evolutionary models representative of these stars. We already have applied this approach with success to pulsating PG1159 stars (GW Vir variables). Our white dwarf models, which cover a wide range of stellar masses, effective temperatures, and envelope thicknesses, are the result of fully evolutionary computations that take into account the complete history of the progenitor stars from the ZAMS. In particular, the models are characterized by self-consistent chemical structures from the centre to the surface, a crucial aspect of white dwarf asteroseismology. We apply this approach to an ensemble of 44 bright DAV (ZZ Ceti) stars.