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- Title
Evolution and asteroseismology of ultra-massive DA white dwarfs.
- Authors
De Gerónimo, F. C.; Córsico, A. H.; Camisassa, M. E.; Althaus, L. G.; Barstow, Martin A.; Kleinman, Scot J.; Provencal, Judith L.; Ferrario, Lilia
- Abstract
Ultra-massive (⩾M⊙) oxygen/neon (ONe) core white dwarfs (WDs) are the result of the evolution of isolated progenitor stars with masses above 6−M⊙. It is expected that hydrogen-rich (DA) ultra-massive WDs harbor crystallized cores at the typical temperatures of the ZZ Ceti instability strip. These stars offer a unique opportunity to study the processes of crystallization and to infer their core chemical composition. We present a study of the evolution and asteroseismology of ultra-massive DA WDs. We found that all pulsating WDs known to date with M⩾1.1M⊙ should have more than 80% of their mass crystallized, if a ONe-core is assumed. Finally, we present a complete asteroseismological analysis to the well known ZZ Ceti BPM 37093 and a preliminary analysis to GD 518 and SDSS J0840+5222.
- Publication
Proceedings of the International Astronomical Union, 2019, Vol 15, Issue S357, p110
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921320001362