Volume 440, Number 1, September II 2005
|Page(s)||L1 - L4|
|Published online||19 August 2005|
Letter to the Editor
The formation of DA white dwarfs with thin hydrogen envelopes
Departament de Física Aplicada, Universitat Politècnica de Catalunya, Av. del Canal Olímpic s/n, 08860 Castelldefels, Barcelona, Spain e-mail: email@example.com
2 Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, (B1900FWA) La Plata, Argentina
3 Instituto de Astrofísica La Plata, IALP, CONICET-UNLP, Argentina
4 Institut d'Estudis Espacials de Catalunya, Ed. Nexus, c/Gran Capità 2, 08034 Barcelona, Spain
Accepted: 9 July 2005
We study the formation and evolution of DA white dwarfs, the progenitors of which have experienced a late thermal pulse (LTP) shortly after the departure from the thermally pulsing AGB. To this end, we compute the complete evolution of an initially star all the way from the zero-age main sequence to the white dwarf stage. We find that most of the original H-rich material of the post-AGB remnant is burnt during the post-LTP evolution, with the result that, at entering its white dwarf cooling track, the remaining H envelope becomes in agreement with asteroseismological inferences for some ZZ Ceti stars.
Key words: stars: evolution / stars: abundances / stars: AGB stars: interiors / stars: white dwarfs / stars: oscillations
© ESO, 2005
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