Issue |
A&A
Volume 440, Number 1, September II 2005
|
|
---|---|---|
Page(s) | L1 - L4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200500159 | |
Published online | 19 August 2005 |
Letter to the Editor
The formation of DA white dwarfs with thin hydrogen envelopes
1
Departament de Física Aplicada, Universitat Politècnica de Catalunya, Av. del Canal Olímpic s/n, 08860 Castelldefels, Barcelona, Spain e-mail: althaus@fcaglp.unlp.edu.ar
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
Received:
18
May
2005
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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