EDP Sciences
Free access
Volume 438, Number 3, August II 2005
Page(s) 1013 - 1020
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042486

A&A 438, 1013-1020 (2005)
DOI: 10.1051/0004-6361:20042486

On the excitation of PG 1159-type pulsations

A. Gautschy1, L. G. Althaus2 and H. Saio3

1  Wetterchrüzstr. 8c, 4410 Liestal, Switzerland
    e-mail: alfred@gautschy.ch
2  Departament de Física Aplicada, Universitat Politècnica de Catalunya, Av. del Canal Olímpic, s/n, 08860, Castelldefels, Barcelona, Spain
3  Astronomical Institute, School of Sciences, Tohoku University, Sendai 980-8578, Japan

(Received 6 December 2004 / Accepted 17 April 2005)

Stability properties are presented of dipole and quadrupole nonradial oscillation modes of model stars that experienced a late helium shell flash on their way to the white-dwarf cooling domain. The computed instability domains are compared with the observed hot variable central stars of planetary nebulae and the GW Vir pulsators.

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

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