[en] We present a unified view of pulsations in both pre-ELM and ELM white dwarfs within the framework of state-of-the-art binary evolution calculations that take into account the combined effects of diffusion and rotational mixing. We find that rotational mixing is able to maintain against settling a sufficient amount of helium in the envelope in order to fuel pulsations through He II-He III ionization on the pre-ELM branch of the evolutionary track in the spectroscopic HR diagram. By the time such a low-mass white dwarf enters the ZZ Ceti instability strip on the cooling branch, settling has taken over rotational mixing and produced a pure H envelope. Such a star then pulsates again, but, this time, as a DA white dwarf of the ZZ Ceti type.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Fontaine, Gilles
Istrate, Alina
Gianninas, Alexandros
Brassard, Pierre
Van Grootel, Valérie ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Language :
English
Title :
Making Sense Out of Pulsating Pre-ELM and ELM White Dwarfs
Publication date :
2017
Event name :
20th European White Dwarf Workshop
Event organizer :
P.E. Tremblay, B. Gaesincke
Event place :
Warwick, United Kingdom
Event date :
25-29 July 2016
Audience :
International
Journal title :
Astronomical Society of the Pacific Conference Series
ISSN :
1050-3390
Publisher :
Astronomical Society of the Pacific, San Francisco, United States - California
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